feat(client,setting): complete Phase 2 with partitioned client_follow_logs

- apps/client (11 models): Client, ClientContact, ClientRequirement,
  ClientSchoolPreference, ClientFollowLog (partitioned),
  ClientFollowLogAttachment, ClientViewing, ClientPropertyMatch,
  ClientStatusLog, ClientFavoriteFolder, ClientFolderItem
- apps/client/0002 RunSQL: PARTITION BY RANGE(created_at) for
  client_follow_logs + monthly partitions + default; triggers
  update_client_last_follow + update_client_viewing_progress;
  partial unique index on client_no WHERE deleted_at IS NULL
- apps/setting (4 models): LookupGroup, LookupItem, TenantSetting,
  FieldRequirementRule (tenant schema only per spec)

manage.py check green; all 9 Phase 2 apps complete.

apps/client/models/follow.py

@@ -0,0 +1,55 @@
+from django.db import models
+
+from core.enums import ClientFollowLogType
+from core.models.base import UUIDPrimaryKeyModel
+
+
+class ClientFollowLog(models.Model):
+    """Partitioned table (PARTITION BY RANGE created_at).
+
+    Managed via RunSQL; Django ORM treats parent as unmanaged.
+    """
+
+    id = models.UUIDField(primary_key=True)
+    created_at = models.DateTimeField()
+    client = models.ForeignKey(
+        "fonrey_client.Client",
+        on_delete=models.CASCADE,
+        related_name="follow_logs",
+    )
+
+    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)
+
+    is_public = models.BooleanField(default=True)
+    is_deletable = models.BooleanField(default=True)
+
+    operator = models.ForeignKey(
+        "org.Staff", null=True, blank=True, on_delete=models.SET_NULL
+    )
+    operator_snapshot = models.JSONField(null=True, blank=True)
+
+    deleted_at = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        db_table = "client_follow_logs"
+        managed = False
+        unique_together = (("id", "created_at"),)
+
+
+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)
+
+    class Meta:
+        db_table = "client_follow_log_attachments"
+        indexes = [models.Index(fields=["follow_log_id"], name="idx_cfla_log")]