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/__init__.py

@@ -0,0 +1,23 @@
+from .contacts import ClientContact, ClientRequirement, ClientSchoolPreference
+from .core import Client
+from .folders import ClientFavoriteFolder, ClientFolderItem
+from .follow import ClientFollowLog, ClientFollowLogAttachment
+from .viewing_match import (
+    ClientPropertyMatch,
+    ClientStatusLog,
+    ClientViewing,
+)
+
+__all__ = [
+    "Client",
+    "ClientContact",
+    "ClientRequirement",
+    "ClientSchoolPreference",
+    "ClientFollowLog",
+    "ClientFollowLogAttachment",
+    "ClientViewing",
+    "ClientPropertyMatch",
+    "ClientStatusLog",
+    "ClientFavoriteFolder",
+    "ClientFolderItem",
+]