style: 淡薰紫 Lavender Breeze + UI修复

- 主色改淡薰紫 #8B9CF7 + 白底 清新风格
- 每个智能体卡不同淡色调
- 删除欢迎卡底部"或直接对我说"
- 运动创建/打卡接入 API
- 全项目薄荷绿→淡紫替换

health_app/lib/pages/remaining_pages.dart

@@ -51,7 +51,7 @@ class ExercisePlanPage extends ConsumerWidget {
         onPressed: () => _createDefaultPlan(ref, context),
         icon: const Icon(Icons.add),
         label: const Text('创建本周计划'),
-        backgroundColor: const Color(0xFF14B8A6),
+        backgroundColor: const Color(0xFF8B9CF7),
       ),
       body: plan.when(
         data: (data) {
@@ -82,7 +82,7 @@ class ExercisePlanPage extends ConsumerWidget {
             }),
           ]);
         },
-        loading: () => const Center(child: CircularProgressIndicator(color: Color(0xFF14B8A6))),
+        loading: () => const Center(child: CircularProgressIndicator(color: Color(0xFF8B9CF7))),
         error: (_, __) => _empty(context, '运动计划', '暂无运动计划，点击右下角创建'),
       ),
     );
@@ -94,7 +94,7 @@ class ExercisePlanPage extends ConsumerWidget {
       margin: const EdgeInsets.all(16),
       padding: const EdgeInsets.all(16),
       decoration: BoxDecoration(
-        color: const Color(0xFFF2FAF9),
+        color: const Color(0xFFF0F2FF),
         borderRadius: BorderRadius.circular(20),
       ),
       child: Column(children: [
@@ -105,7 +105,7 @@ class ExercisePlanPage extends ConsumerWidget {
             width: 60,
             height: 60,
             decoration: BoxDecoration(
-              color: const Color(0xFF14B8A6),
+              color: const Color(0xFF8B9CF7),
               borderRadius: BorderRadius.circular(30),
             ),
             child: Center(
@@ -123,7 +123,7 @@ class ExercisePlanPage extends ConsumerWidget {
                 child: FractionallySizedBox(
                   widthFactor: progress / 100,
                   child: Container(
-                    decoration: BoxDecoration(color: const Color(0xFF14B8A6), borderRadius: BorderRadius.circular(4)),
+                    decoration: BoxDecoration(color: const Color(0xFF8B9CF7), borderRadius: BorderRadius.circular(4)),
                   ),
                 ),
               ),
@@ -152,7 +152,7 @@ class ExercisePlanPage extends ConsumerWidget {
     if (!context.mounted) return;
     ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
       content: Text('运动计划已创建 ✅'),
-      backgroundColor: Color(0xFF14B8A6),
+      backgroundColor: Color(0xFF8B9CF7),
     ));
   }
 
@@ -199,21 +199,21 @@ class _ExercisePlanItem extends StatelessWidget {
         color: isToday ? const Color(0xFFFEFCE8) : Colors.white,
         borderRadius: BorderRadius.circular(16),
         border: isToday ? Border.all(color: const Color(0xFFFCD34D), width: 2) : null,
-        boxShadow: [BoxShadow(color: const Color(0xFF14B8A6).withAlpha(8), blurRadius: 4, offset: const Offset(0, 2))],
+        boxShadow: [BoxShadow(color: const Color(0xFF8B9CF7).withAlpha(8), blurRadius: 4, offset: const Offset(0, 2))],
       ),
       child: Row(children: [
         Container(
           width: 40,
           height: 40,
           decoration: BoxDecoration(
-            color: isDone ? const Color(0xFFDCFCE7) : isRest ? const Color(0xFFF3F4F6) : const Color(0xFFF2FAF9),
+            color: isDone ? const Color(0xFFDCFCE7) : isRest ? const Color(0xFFF3F4F6) : const Color(0xFFF0F2FF),
             borderRadius: BorderRadius.circular(12),
           ),
           child: isDone
               ? const Icon(Icons.check, size: 20, color: Color(0xFF43A047))
               : isRest
                   ? const Icon(Icons.coffee, size: 20, color: Color(0xFF999999))
-                  : const Icon(Icons.directions_run, size: 20, color: Color(0xFF14B8A6)),
+                  : const Icon(Icons.directions_run, size: 20, color: Color(0xFF8B9CF7)),
         ),
         const SizedBox(width: 12),
         Expanded(
@@ -235,7 +235,7 @@ class _ExercisePlanItem extends StatelessWidget {
             onPressed: onCheckIn,
             child: const Text('打卡'),
             style: ElevatedButton.styleFrom(
-              backgroundColor: const Color(0xFF14B8A6),
+              backgroundColor: const Color(0xFF8B9CF7),
               foregroundColor: Colors.white,
               shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
               padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
@@ -257,7 +257,7 @@ class FollowUpListPage extends ConsumerWidget {
       floatingActionButton: FloatingActionButton(
         onPressed: () => _showAddDialog(context),
         child: const Icon(Icons.add),
-        backgroundColor: const Color(0xFF14B8A6),
+        backgroundColor: const Color(0xFF8B9CF7),
       ),
       body: ListView(children: _mockFollowUps.map((item) => _FollowUpItem(item: item)).toList()),
     );
@@ -284,7 +284,7 @@ class FollowUpListPage extends ConsumerWidget {
               Navigator.pop(ctx);
               ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
                 content: Text('复查提醒已添加 ✅'),
-                backgroundColor: Color(0xFF14B8A6),
+                backgroundColor: Color(0xFF8B9CF7),
               ));
             },
             child: const Text('保存'),
@@ -314,7 +314,7 @@ class _FollowUpItem extends StatelessWidget {
       decoration: BoxDecoration(
         color: Colors.white,
         borderRadius: BorderRadius.circular(16),
-        boxShadow: [BoxShadow(color: const Color(0xFF14B8A6).withAlpha(10), blurRadius: 4, offset: const Offset(0, 2))],
+        boxShadow: [BoxShadow(color: const Color(0xFF8B9CF7).withAlpha(10), blurRadius: 4, offset: const Offset(0, 2))],
       ),
       child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
         Row(children: [
@@ -513,7 +513,7 @@ class _HealthCalendarPageState extends ConsumerState<HealthCalendarPage> {
 
     return Container(
       decoration: isToday ? BoxDecoration(
-        color: const Color(0xFF14B8A6),
+        color: const Color(0xFF8B9CF7),
         borderRadius: BorderRadius.circular(20),
       ) : null,
       child: Stack(
@@ -555,7 +555,7 @@ class _HealthCalendarPageState extends ConsumerState<HealthCalendarPage> {
 
   Color _getEventColor(String type) {
     switch (type) {
-      case 'medication': return const Color(0xFF14B8A6);
+      case 'medication': return const Color(0xFF8B9CF7);
       case 'exercise': return const Color(0xFF43A047);
       case 'followup': return const Color(0xFFF59E0B);
       default: return Colors.grey;
@@ -564,7 +564,7 @@ class _HealthCalendarPageState extends ConsumerState<HealthCalendarPage> {
 
   Widget _buildLegend() {
     final items = [
-      {'color': const Color(0xFF14B8A6), 'label': '用药提醒'},
+      {'color': const Color(0xFF8B9CF7), 'label': '用药提醒'},
       {'color': const Color(0xFF43A047), 'label': '运动计划'},
       {'color': const Color(0xFFF59E0B), 'label': '复查随访'},
     ];