feat(client): add Chinese verbose_name and help_text to all client fields (Phase 4.1 part 2/9)

Sync DATA_MODEL_CLIENT.md field-level Chinese annotations to Django
models across 11 client tables (Client, ClientContact, ClientRequirement,
ClientSchoolPreference, ClientFavoriteFolder, ClientFolderItem,
ClientFollowLog, ClientFollowLogAttachment, ClientViewing,
ClientPropertyMatch, ClientStatusLog).

Pre-existing docstrings retained on ClientFollowLog (partitioned parent
treated as unmanaged) and ClientStatusLog (immutable audit log).

apps/client/models/folders.py

@@ -5,13 +5,36 @@ from core.models.base import UUIDPrimaryKeyModel
 
 class ClientFavoriteFolder(UUIDPrimaryKeyModel):
     staff = models.ForeignKey(
-        "org.Staff", on_delete=models.CASCADE, related_name="favorite_folders"
+        "org.Staff",
+        on_delete=models.CASCADE,
+        related_name="favorite_folders",
+        verbose_name="所属经纪人",
+    )
+    name = models.CharField(
+        max_length=10,
+        verbose_name="收藏夹名称",
+        help_text="最多10字",
+    )
+    is_default = models.BooleanField(
+        default=False,
+        verbose_name="是否默认",
+        help_text="系统默认收藏夹，每个经纪人只能有一个",
+    )
+    sort_order = models.IntegerField(
+        default=0,
+        verbose_name="显示顺序",
+        help_text="升序排列",
+    )
+    created_at = models.DateTimeField(
+        auto_now_add=True,
+        verbose_name="创建时间",
+    )
+    deleted_at = models.DateTimeField(
+        null=True,
+        blank=True,
+        verbose_name="删除时间",
+        help_text="软删除时间戳；NULL=未删除",
     )
-    name = models.CharField(max_length=10)
-    is_default = models.BooleanField(default=False)
-    sort_order = models.IntegerField(default=0)
-    created_at = models.DateTimeField(auto_now_add=True)
-    deleted_at = models.DateTimeField(null=True, blank=True)
 
     class Meta:
         db_table = "client_favorite_folders"
@@ -31,12 +54,21 @@ class ClientFavoriteFolder(UUIDPrimaryKeyModel):
 
 class ClientFolderItem(models.Model):
     folder = models.ForeignKey(
-        ClientFavoriteFolder, on_delete=models.CASCADE, related_name="items"
+        ClientFavoriteFolder,
+        on_delete=models.CASCADE,
+        related_name="items",
+        verbose_name="所属收藏夹",
     )
     client = models.ForeignKey(
-        "fonrey_client.Client", on_delete=models.CASCADE, related_name="folder_items"
+        "fonrey_client.Client",
+        on_delete=models.CASCADE,
+        related_name="folder_items",
+        verbose_name="被收藏的客源",
+    )
+    added_at = models.DateTimeField(
+        auto_now_add=True,
+        verbose_name="加入收藏夹时间",
     )
-    added_at = models.DateTimeField(auto_now_add=True)
 
     class Meta:
         db_table = "client_folder_items"