移除 MJRefresh 依赖，恢复 SwiftUI 系统下拉刷新。

同时收紧各 ViewModel 内部 isLoading 可见性，避免不必要的视图刷新。

Co-authored-by: Cursor <cursoragent@cursor.com>

Pods/Manifest.lock

@@ -6,13 +6,11 @@ PODS:
     - AMapFoundation-NO-IDFA (>= 1.8.7)
   - AMapSearch-NO-IDFA (9.7.5):
     - AMapFoundation-NO-IDFA (>= 1.8.0)
-  - MJRefresh (3.7.9)
 
 DEPENDENCIES:
   - AMap3DMap-NO-IDFA (~> 11.1)
   - AMapLocation-NO-IDFA (~> 2.11)
   - AMapSearch-NO-IDFA (~> 9.7)
-  - MJRefresh (~> 3.7)
 
 SPEC REPOS:
   trunk:
@@ -20,15 +18,13 @@ SPEC REPOS:
     - AMapFoundation-NO-IDFA
     - AMapLocation-NO-IDFA
     - AMapSearch-NO-IDFA
-    - MJRefresh
 
 SPEC CHECKSUMS:
   AMap3DMap-NO-IDFA: 393a24abb0451fed2daa4316c8d3d356a395f2be
   AMapFoundation-NO-IDFA: f48acbf6e74913dc6744581053f7d984f2432850
   AMapLocation-NO-IDFA: 0fa6e7d5e42e10253f4437424d98966f53760862
   AMapSearch-NO-IDFA: 8e9d104032990a3b0cab66afb535299887c61047
-  MJRefresh: ff9e531227924c84ce459338414550a05d2aea78
 
-PODFILE CHECKSUM: dd39a238c7d1f1de8b61bcb07e20911bedae96b7
+PODFILE CHECKSUM: baa972253fcebc312545f7592c48cbba632f1907
 
 COCOAPODS: 1.16.2