Initial commit: 健康管家 AI 健康陪伴助手

- Backend: .NET 10 Minimal API + EF Core + PostgreSQL
- Frontend: Flutter + Riverpod + GoRouter + Dio
- AI: DeepSeek LLM + Qwen VLM (OpenAI-compatible)
- Auth: SMS + JWT (access/refresh tokens)
- Features: AI chat, health tracking, medication management, diet analysis, exercise plans, doctor consultations, report analysis

health_app/lib/core/app_theme.dart

@@ -0,0 +1,77 @@
+import 'package:flutter/material.dart';
+
+/// 健康管家主题配置——薰衣草紫 + 温暖治愈风
+class AppTheme {
+  AppTheme._();
+
+  static const Color primaryColor = Color(0xFF635BFF);
+  static const Color primaryLight = Color(0xFFEDEBFF);
+  static const Color primaryDark = Color(0xFF4B44D6);
+  static const Color background = Color(0xFFF8F9FF);
+  static const Color cardWhite = Color(0xFFFFFFFF);
+  static const Color textPrimary = Color(0xFF1A1A1A);
+  static const Color textSecondary = Color(0xFF666666);
+  static const Color textPlaceholder = Color(0xFF999999);
+  static const Color successGreen = Color(0xFF43A047);
+  static const Color errorRed = Color(0xFFE53935);
+  static const Color warningYellow = Color(0xFFF9A825);
+  static const Color secondaryButton = Color(0xFFE5E5F7);
+
+  static ThemeData get lightTheme => ThemeData(
+        useMaterial3: true,
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: primaryColor,
+          primary: primaryColor,
+          surface: background,
+          brightness: Brightness.light,
+        ),
+        scaffoldBackgroundColor: background,
+        appBarTheme: const AppBarTheme(
+          backgroundColor: cardWhite,
+          foregroundColor: textPrimary,
+          elevation: 0,
+          centerTitle: true,
+        ),
+        cardTheme: CardThemeData(
+          color: cardWhite,
+          elevation: 0,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+          margin: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+        ),
+        inputDecorationTheme: InputDecorationTheme(
+          filled: true,
+          fillColor: cardWhite,
+          contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+          border: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(12),
+            borderSide: const BorderSide(color: secondaryButton, width: 1.5),
+          ),
+          enabledBorder: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(12),
+            borderSide: const BorderSide(color: secondaryButton, width: 1.5),
+          ),
+          focusedBorder: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(12),
+            borderSide: const BorderSide(color: primaryColor, width: 1.5),
+          ),
+          hintStyle: const TextStyle(color: textPlaceholder, fontSize: 16),
+        ),
+        elevatedButtonTheme: ElevatedButtonThemeData(
+          style: ElevatedButton.styleFrom(
+            backgroundColor: primaryColor,
+            foregroundColor: Colors.white,
+            minimumSize: const Size(double.infinity, 48),
+            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(24)),
+            textStyle: const TextStyle(fontSize: 18, fontWeight: FontWeight.w600),
+          ),
+        ),
+        textTheme: const TextTheme(
+          headlineLarge: TextStyle(fontSize: 24, fontWeight: FontWeight.w600, color: textPrimary),
+          titleLarge: TextStyle(fontSize: 20, fontWeight: FontWeight.w600, color: textPrimary),
+          bodyLarge: TextStyle(fontSize: 18, fontWeight: FontWeight.w400, color: textPrimary),
+          bodyMedium: TextStyle(fontSize: 16, fontWeight: FontWeight.w400, color: textSecondary),
+          labelMedium: TextStyle(fontSize: 14, fontWeight: FontWeight.w400, color: textSecondary),
+          labelSmall: TextStyle(fontSize: 12, fontWeight: FontWeight.w400, color: textSecondary),
+        ),
+      );
+}