style: 全项目紫色→薄荷绿 Fresh Air 清新风

- 主色 #635BFF→#14B8A6 (薄荷绿)
- 浅紫 #EDEBFF→#E6FAF6 (极浅薄荷)
- 深紫 #4B44D6→#0F9D8E (深薄荷)
- 渐变紫→薄荷渐变
- 全局13种紫色映射替换

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(0xFFEDEBFF),
+                      backgroundColor: const Color(0xFFE6FAF6),
                       child: Text(
                         (d['name'] as String?)?.isNotEmpty == true ? d['name']![0] : '?',
-                        style: const TextStyle(fontSize: 22, color: Color(0xFF635BFF)),
+                        style: const TextStyle(fontSize: 22, color: Color(0xFF14B8A6)),
                       ),
                     ),
                     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(0xFF635BFF))),
+                          Text(d['department'] ?? '', style: const TextStyle(fontSize: 14, color: Color(0xFF14B8A6))),
                           const SizedBox(height: 2),
                           Text(d['introduction'] ?? '', style: const TextStyle(fontSize: 14, color: Color(0xFF999999))),
                         ],