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/follow.py

@@ -10,29 +10,86 @@ class ClientFollowLog(models.Model):
     Managed via RunSQL; Django ORM treats parent as unmanaged.
     """
 
-    id = models.UUIDField(primary_key=True)
-    created_at = models.DateTimeField()
+    id = models.UUIDField(
+        primary_key=True,
+        verbose_name="主键",
+    )
+    created_at = models.DateTimeField(
+        verbose_name="创建时间",
+        help_text="分区键",
+    )
     client = models.ForeignKey(
         "fonrey_client.Client",
         on_delete=models.CASCADE,
         related_name="follow_logs",
+        verbose_name="所属客源",
+        help_text="跟进日志随客源级联删除",
     )
 
-    log_type = models.CharField(max_length=30, choices=ClientFollowLogType.choices)
-    purpose = models.CharField(max_length=50, blank=True, default="")
-    content = models.TextField(blank=True, default="")
-    log_tag = models.CharField(max_length=50, blank=True, default="")
-    change_detail = models.JSONField(null=True, blank=True)
+    log_type = models.CharField(
+        max_length=30,
+        choices=ClientFollowLogType.choices,
+        verbose_name="跟进类型",
+        help_text="written=写入跟进 / modified=修改跟进 / sensitive_view=敏感信息查看（不可删） / other=其他跟进 / system=系统日志",
+    )
+    purpose = models.CharField(
+        max_length=50,
+        blank=True,
+        default="",
+        verbose_name="跟进目的",
+        help_text="lookup_items 维护，23项",
+    )
+    content = models.TextField(
+        blank=True,
+        default="",
+        verbose_name="跟进内容",
+        help_text="最少6字，最多500字",
+    )
+    log_tag = models.CharField(
+        max_length=50,
+        blank=True,
+        default="",
+        verbose_name="跟进标签",
+        help_text="has_recording=有录音 / has_photo=有图片 / not_satisfied=对房源不满意 / still_considering=还在考虑 / ready_to_deposit=可交定金",
+    )
+    change_detail = models.JSONField(
+        null=True,
+        blank=True,
+        verbose_name="字段变更明细",
+        help_text='修改跟进专用，格式：{"field": "grade", "old": "C", "new": "B", "label": "等级"}',
+    )
 
-    is_public = models.BooleanField(default=True)
-    is_deletable = models.BooleanField(default=True)
+    is_public = models.BooleanField(
+        default=True,
+        verbose_name="是否公开",
+        help_text="FALSE=仅本人及上级可见",
+    )
+    is_deletable = models.BooleanField(
+        default=True,
+        verbose_name="是否可删除",
+        help_text="敏感信息查看类型为 FALSE，不可删除",
+    )
 
     operator = models.ForeignKey(
-        "org.Staff", null=True, blank=True, on_delete=models.SET_NULL
+        "org.Staff",
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        verbose_name="操作人",
+    )
+    operator_snapshot = models.JSONField(
+        null=True,
+        blank=True,
+        verbose_name="操作人快照",
+        help_text="{name, store_group, role}（防止人员调动后显示异常）",
     )
-    operator_snapshot = models.JSONField(null=True, blank=True)
 
-    deleted_at = models.DateTimeField(null=True, blank=True)
+    deleted_at = models.DateTimeField(
+        null=True,
+        blank=True,
+        verbose_name="删除时间",
+        help_text="仅 is_deletable=TRUE 时可软删",
+    )
 
     class Meta:
         db_table = "client_follow_logs"
@@ -43,14 +100,43 @@ class ClientFollowLog(models.Model):
 
 
 class ClientFollowLogAttachment(UUIDPrimaryKeyModel):
-    follow_log_id = models.UUIDField()  # cross-partitioned FK; not enforced via Django FK
-    file_key = models.TextField()
-    file_name = models.CharField(max_length=255)
-    file_size = models.IntegerField()
-    file_type = models.CharField(max_length=10, blank=True, default="")
-    has_location = models.BooleanField(default=False)
-    sort_order = models.SmallIntegerField(default=0)
-    created_at = models.DateTimeField(auto_now_add=True)
+    follow_log_id = models.UUIDField(
+        verbose_name="所属跟进日志ID",
+        help_text="跨分区 FK；不通过 Django FK 强制约束",
+    )
+    file_key = models.TextField(
+        verbose_name="文件存储路径",
+        help_text="R2/S3 存储路径",
+    )
+    file_name = models.CharField(
+        max_length=255,
+        verbose_name="文件名",
+        help_text="原始文件名（用于展示和下载）",
+    )
+    file_size = models.IntegerField(
+        verbose_name="文件大小",
+        help_text="单位：bytes，最大 20MB",
+    )
+    file_type = models.CharField(
+        max_length=10,
+        blank=True,
+        default="",
+        verbose_name="文件类型",
+        help_text="bmp / jpg / png / gif",
+    )
+    has_location = models.BooleanField(
+        default=False,
+        verbose_name="是否含位置信息",
+        help_text="是否含 GPS 位置信息",
+    )
+    sort_order = models.SmallIntegerField(
+        default=0,
+        verbose_name="排序顺序",
+    )
+    created_at = models.DateTimeField(
+        auto_now_add=True,
+        verbose_name="创建时间",
+    )
 
     class Meta:
         db_table = "client_follow_log_attachments"