fix: VLM 参数优化 - temperature 0.7, top_p 0.8, 指令放 system+user

- VisionAsync 新增 Temperature=0.7, TopP=0.8
- system prompt 用专业营养识别指令
- userText 用简短"请看图识别食物"配合图片
- 修复重复 prompt 导致 VLM 误读文本的 bug

health_app/lib/pages/auth/login_page.dart

@@ -3,12 +3,10 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import '../../core/navigation_provider.dart';
 import '../../providers/auth_provider.dart';
 
-/// 登录页——手机号 + 验证码
 class LoginPage extends ConsumerStatefulWidget {
   const LoginPage({super.key});
 
-  @override
-  ConsumerState<LoginPage> createState() => _LoginPageState();
+  @override ConsumerState<LoginPage> createState() => _LoginPageState();
 }
 
 class _LoginPageState extends ConsumerState<LoginPage> {
@@ -20,165 +18,70 @@ class _LoginPageState extends ConsumerState<LoginPage> {
   bool _loading = false;
   String? _error;
 
-  @override
-  void dispose() {
-    _phoneCtrl.dispose();
-    _codeCtrl.dispose();
-    super.dispose();
-  }
+  @override void dispose() { _phoneCtrl.dispose(); _codeCtrl.dispose(); super.dispose(); }
 
   Future<void> _sendSms() async {
     final phone = _phoneCtrl.text.trim();
-    if (phone.length != 11 || !phone.startsWith('1')) {
-      setState(() => _error = '请输入正确的手机号');
-      return;
-    }
+    if (phone.length != 11 || !phone.startsWith('1')) { setState(() => _error = '请输入正确的手机号'); return; }
     setState(() { _sending = true; _error = null; });
     final result = await ref.read(authProvider.notifier).sendSms(phone);
     setState(() { _sending = false; });
-    if (result.error != null) {
-      setState(() => _error = result.error);
-      return;
-    }
-    // 开发阶段自动填充验证码
-    if (result.devCode != null) {
-      _codeCtrl.text = result.devCode!;
-    }
-    setState(() => _countdown = 60);
-    _startCountdown();
+    if (result.error != null) { setState(() => _error = result.error); return; }
+    if (result.devCode != null) _codeCtrl.text = result.devCode!;
+    setState(() => _countdown = 60); _startCountdown();
   }
 
   void _startCountdown() async {
-    for (var i = 60; i > 0; i--) {
-      await Future.delayed(const Duration(seconds: 1));
-      if (!mounted) return;
-      setState(() => _countdown = i - 1);
-    }
+    for (var i = 60; i > 0; i--) { await Future.delayed(const Duration(seconds: 1)); if (!mounted) return; setState(() => _countdown = i - 1); }
   }
 
   Future<void> _login() async {
-    if (!_agreed) {
-      setState(() => _error = '请阅读并同意服务协议和隐私政策');
-      return;
-    }
+    if (!_agreed) { setState(() => _error = '请阅读并同意服务协议和隐私政策'); return; }
     setState(() { _loading = true; _error = null; });
-    final err = await ref.read(authProvider.notifier).login(
-      _phoneCtrl.text.trim(),
-      _codeCtrl.text.trim(),
-    );
-    setState(() => _loading = false);
-    if (err != null) {
-      setState(() => _error = err);
-      return;
-    }
+    final err = await ref.read(authProvider.notifier).login(_phoneCtrl.text.trim(), _codeCtrl.text.trim());
+    setState(() => _loading = false );
+    if (err != null) { setState(() => _error = err); return; }
     goRoute(ref, 'home');
   }
 
-  @override
-  Widget build(BuildContext context) {
+  @override Widget build(BuildContext context) {
     final authState = ref.watch(authProvider);
-
-    // 已登录直接跳转
-    if (authState.isLoggedIn && !authState.isLoading) {
-      WidgetsBinding.instance.addPostFrameCallback((_) => goRoute(ref, 'home'));
-    }
+    if (authState.isLoggedIn && !authState.isLoading) WidgetsBinding.instance.addPostFrameCallback((_) => goRoute(ref, 'home'));
 
     return Scaffold(
-      body: SafeArea(
-        child: SingleChildScrollView(
-          padding: const EdgeInsets.symmetric(horizontal: 24),
-          child: Column(
-            children: [
-              const SizedBox(height: 80),
-              // Logo
-              Icon(Icons.local_hospital, size: 64, color: Theme.of(context).colorScheme.primary),
-              const SizedBox(height: 16),
-              Text('健康管家', style: Theme.of(context).textTheme.headlineLarge),
-              const SizedBox(height: 8),
-              Text('您的 AI 健康陪伴助手', style: Theme.of(context).textTheme.bodyMedium),
-              const SizedBox(height: 48),
-
-              // 手机号
-              TextField(
-                controller: _phoneCtrl,
-                keyboardType: TextInputType.phone,
-                maxLength: 11,
-                decoration: const InputDecoration(
-                  hintText: '手机号',
-                  prefixText: '+86 ',
-                  counterText: '',
-                ),
-              ),
-              const SizedBox(height: 16),
-
-              // 验证码
-              Row(
-                children: [
-                  Expanded(
-                    child: TextField(
-                      controller: _codeCtrl,
-                      keyboardType: TextInputType.number,
-                      maxLength: 6,
-                      decoration: const InputDecoration(hintText: '验证码', counterText: ''),
-                    ),
-                  ),
-                  const SizedBox(width: 12),
-                  SizedBox(
-                    width: 120,
-                    height: 48,
-                    child: ElevatedButton(
-                      onPressed: (_countdown > 0 || _sending) ? null : _sendSms,
-                      style: ElevatedButton.styleFrom(
-                        backgroundColor: _countdown > 0 ? Colors.grey[300] : null,
-                      ),
-                      child: Text(
-                        _sending ? '发送中' : _countdown > 0 ? '${_countdown}s' : '获取验证码',
-                        style: TextStyle(fontSize: 14, color: _countdown > 0 ? Colors.grey[600] : null),
-                      ),
-                    ),
-                  ),
-                ],
-              ),
-              const SizedBox(height: 16),
-
-              // 协议勾选
-              Row(
-                children: [
-                  Checkbox(value: _agreed, onChanged: (v) => setState(() => _agreed = v ?? false)),
-                  GestureDetector(
-                    onTap: () => setState(() => _agreed = !_agreed),
-                    child: Text('已阅读并同意《服务协议》《隐私政策》', style: Theme.of(context).textTheme.labelMedium),
-                  ),
-                ],
-              ),
-              const SizedBox(height: 24),
-
-              // 登录按钮
-              if (_error != null)
-                Padding(
-                  padding: const EdgeInsets.only(bottom: 12),
-                  child: Text(_error!, style: const TextStyle(color: AppColors.errorRed, fontSize: 14)),
-                ),
-              SizedBox(
-                width: double.infinity,
-                height: 48,
-                child: ElevatedButton(
-                  onPressed: _loading ? null : _login,
-                  child: _loading
-                    ? const SizedBox(width: 24, height: 24, child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
-                    : const Text('登 录'),
-                ),
-              ),
-              const SizedBox(height: 80),
-            ],
-          ),
-        ),
+      body: Container(
+        decoration: const BoxDecoration(gradient: LinearGradient(begin: Alignment.topLeft, end: Alignment.bottomRight, colors: [Color(0xFFF5F3FF), Color(0xFFEDEBFF), Color(0xFFE8E4FF)])),
+        child: SafeArea(child: SingleChildScrollView(padding: const EdgeInsets.symmetric(horizontal: 32), child: Column(children: [
+          const SizedBox(height: 60),
+          Container(width: 140, height: 140, decoration: BoxDecoration(color: const Color(0xFF635BFF).withAlpha(20), borderRadius: BorderRadius.circular(70)), child: Stack(alignment: Alignment.center, children: [
+            Container(width: 100, height: 100, decoration: BoxDecoration(color: Colors.white.withAlpha(200), borderRadius: BorderRadius.circular(50)), child: Icon(Icons.favorite, size: 50, color: const Color(0xFF635BFF))),
+            Positioned(right: 10, top: 10, child: Container(width: 30, height: 30, decoration: BoxDecoration(color: const Color(0xFFFFB800), borderRadius: BorderRadius.circular(15), border: Border.all(color: Colors.white, width: 2)), child: const Icon(Icons.add, size: 16, color: Colors.white))),
+          ])),
+          const SizedBox(height: 24),
+          Text('健康管家', style: TextStyle(fontSize: 28, fontWeight: FontWeight.bold, color: const Color(0xFF1A1A1A))),
+          const SizedBox(height: 8),
+          Text('你的 AI 心脏健康管家', style: TextStyle(fontSize: 15, color: Colors.grey[500])),
+          const SizedBox(height: 48),
+          TextField(controller: _phoneCtrl, keyboardType: TextInputType.phone, maxLength: 11,
+            decoration: InputDecoration(hintText: '请输入手机号', prefixIcon: const Padding(padding: EdgeInsets.only(left: 12), child: Text('+86', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w500))), counterText: '', filled: true, fillColor: Colors.white, border: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: BorderSide.none), enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: BorderSide.none), focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: const BorderSide(color: Color(0xFF635BFF), width: 1.5)))),
+          const SizedBox(height: 16),
+          Row(children: [
+            Expanded(child: TextField(controller: _codeCtrl, keyboardType: TextInputType.number, maxLength: 6,
+              decoration: InputDecoration(hintText: '验证码', filled: true, fillColor: Colors.white, border: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: BorderSide.none), enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: BorderSide.none), focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: const BorderSide(color: Color(0xFF635BFF), width: 1.5)), counterText: ''))),
+            const SizedBox(width: 12),
+            GestureDetector(onTap: (_countdown > 0 || _sending) ? null : _sendSms, child: Container(width: 100, height: 48, alignment: Alignment.center, decoration: BoxDecoration(color: _countdown > 0 ? Colors.grey[300] : const Color(0xFF635BFF), borderRadius: BorderRadius.circular(12)), child: Text(_sending ? '发送中' : _countdown > 0 ? '${_countdown}s' : '获取验证码', style: TextStyle(fontSize: 14, color: _countdown > 0 ? Colors.grey[600] : Colors.white, fontWeight: FontWeight.w500)))),
+          ]),
+          const SizedBox(height: 8),
+          Align(alignment: Alignment.centerLeft, child: GestureDetector(onTap: () => setState(() => _agreed = !_agreed), child: Row(mainAxisSize: MainAxisSize.min, children: [
+            Container(width: 20, height: 20, margin: const EdgeInsets.only(right: 6), decoration: BoxDecoration(shape: BoxShape.rectangle, color: _agreed ? const Color(0xFF635BFF) : Colors.transparent, border: Border.all(color: _agreed ? const Color(0xFF635BFF) : const Color(0xFFBDBDBD), width: 1.5), borderRadius: BorderRadius.circular(4)), child: _agreed ? const Icon(Icons.check, size: 14, color: Colors.white) : null),
+            RichText(text: TextSpan(children: [TextSpan(text: '已阅读并同意', style: TextStyle(fontSize: 13, color: Colors.grey[600])), TextSpan(text: '《服务协议》', style: const TextStyle(fontSize: 13, color: Color(0xFF635BFF))), TextSpan(text: '和', style: TextStyle(fontSize: 13, color: Colors.grey[600])), TextSpan(text: '《隐私政策》', style: const TextStyle(fontSize: 13, color: Color(0xFF635BFF)))])),
+          ]))),
+          if (_error != null) Padding(padding: const EdgeInsets.only(top: 12), child: Text(_error!, style: const TextStyle(color: Color(0xFFE53935), fontSize: 13))),
+          const SizedBox(height: 24),
+          GestureDetector(onTap: _loading ? null : _login, child: Container(width: double.infinity, height: 50, alignment: Alignment.center, decoration: BoxDecoration(gradient: const LinearGradient(colors: [Color(0xFF7C73FF), Color(0xFF635BFF)]), borderRadius: BorderRadius.circular(25), boxShadow: [BoxShadow(color: const Color(0xFF635BFF).withAlpha(80), blurRadius: 16, offset: const Offset(0, 8))]), child: _loading ? const SizedBox(width: 24, height: 24, child: CircularProgressIndicator(strokeWidth: 2.5, color: Colors.white)) : const Text('登 录', style: TextStyle(fontSize: 17, color: Colors.white, fontWeight: FontWeight.w600, letterSpacing: 2)))),
+          const SizedBox(height: 40),
+        ]))),
       ),
     );
   }
 }
-
-/// 引用 AppTheme 颜色
-class AppColors {
-  static const Color errorRed = Color(0xFFE53935);
-}