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/medication/medication_edit_page.dart

@@ -99,7 +99,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
           content: Text('已添加 ${_items.length} 种药品'),
-          backgroundColor: const Color(0xFF14B8A6),
+          backgroundColor: const Color(0xFF8B9CF7),
         ),
       );
       ref.invalidate(medicationListProvider);
@@ -136,7 +136,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: const Color(0xFFF6F9FB),
+      backgroundColor: const Color(0xFFF8F9FC),
       appBar: AppBar(
         backgroundColor: Colors.white,
         elevation: 0,
@@ -158,7 +158,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
             child: const Text(
               '保存',
               style: TextStyle(
-                color: Color(0xFF14B8A6),
+                color: Color(0xFF8B9CF7),
                 fontWeight: FontWeight.w600,
               ),
             ),
@@ -204,7 +204,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
                 style: const TextStyle(
                   fontSize: 13,
                   fontWeight: FontWeight.w600,
-                  color: Color(0xFF14B8A6),
+                  color: Color(0xFF8B9CF7),
                 ),
               ),
               if (_items.length > 1)
@@ -390,7 +390,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
         child: Row(
           mainAxisSize: MainAxisSize.min,
           children: [
-            const Icon(Icons.access_time, size: 16, color: Color(0xFF14B8A6)),
+            const Icon(Icons.access_time, size: 16, color: Color(0xFF8B9CF7)),
             const SizedBox(width: 6),
             Text(
               time.format(context),
@@ -410,11 +410,11 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
         icon: const Icon(Icons.add, size: 18),
         label: const Text('添加', style: TextStyle(fontSize: 14)),
         style: OutlinedButton.styleFrom(
-          foregroundColor: const Color(0xFF14B8A6),
-          side: const BorderSide(color: Color(0xFFC0E8E2)),
+          foregroundColor: const Color(0xFF8B9CF7),
+          side: const BorderSide(color: Color(0xFFD0D5FC)),
           padding: const EdgeInsets.symmetric(vertical: 12),
           shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
-          backgroundColor: const Color(0xFFF2FAF9),
+          backgroundColor: const Color(0xFFF0F2FF),
         ),
       ),
     );
@@ -438,7 +438,7 @@ class _MedicationEditPageState extends ConsumerState<MedicationEditPage> {
       ),
       focusedBorder: OutlineInputBorder(
         borderRadius: BorderRadius.circular(8),
-        borderSide: const BorderSide(color: Color(0xFF14B8A6)),
+        borderSide: const BorderSide(color: Color(0xFF8B9CF7)),
       ),
     );
   }