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/consultation/consultation_pages.dart

@@ -36,10 +36,10 @@ class DoctorListPage extends ConsumerWidget {
                   child: Row(children: [
                     CircleAvatar(
                       radius: 28,
-                      backgroundColor: const Color(0xFFE6FAF6),
+                      backgroundColor: const Color(0xFFF0F2FF),
                       child: Text(
                         (d['name'] as String?)?.isNotEmpty == true ? d['name']![0] : '?',
-                        style: const TextStyle(fontSize: 22, color: Color(0xFF14B8A6)),
+                        style: const TextStyle(fontSize: 22, color: Color(0xFF8B9CF7)),
                       ),
                     ),
                     const SizedBox(width: 16),
@@ -53,7 +53,7 @@ class DoctorListPage extends ConsumerWidget {
                             Text(d['title'] ?? '', style: const TextStyle(fontSize: 14, color: Color(0xFF666666))),
                           ]),
                           const SizedBox(height: 4),
-                          Text(d['department'] ?? '', style: const TextStyle(fontSize: 14, color: Color(0xFF14B8A6))),
+                          Text(d['department'] ?? '', style: const TextStyle(fontSize: 14, color: Color(0xFF8B9CF7))),
                           const SizedBox(height: 2),
                           Text(d['introduction'] ?? '', style: const TextStyle(fontSize: 14, color: Color(0xFF999999))),
                         ],