feat: scaffold Django multi-tenant project with 5 of 9 apps

Phase 1 scaffolding: config/, core/, base models, AES-256-GCM phone encryption, enums mirror

apps.tenant: Tenant + Domain (django-tenants)

apps.org: 11 models (OrgUnit hierarchy, Staff, audit logs)

apps.account: 4 models (UserAccount as AUTH_USER_MODEL, login/password tracking)

apps.permission: 7 models (RBAC + overrides + datascope + append-only changelog)

apps.region: 5 models (District, BusinessArea, MetroLine, MetroStation, School)

All migrations generated, manage.py check passes

apps/org/models/__init__.py

@@ -0,0 +1,26 @@
+from apps.org.models.org_unit import OrgUnit
+from apps.org.models.staff import Staff, StaffPersonalInfo
+from apps.org.models.staff_logs import (
+    StaffAccount,
+    StaffEducation,
+    StaffFamilyMember,
+    StaffRemark,
+    StaffRewardPunish,
+    StaffTraining,
+    StaffTransferLog,
+    StaffWorkExperience,
+)
+
+__all__ = [
+    "OrgUnit",
+    "Staff",
+    "StaffPersonalInfo",
+    "StaffAccount",
+    "StaffEducation",
+    "StaffFamilyMember",
+    "StaffRemark",
+    "StaffRewardPunish",
+    "StaffTraining",
+    "StaffTransferLog",
+    "StaffWorkExperience",
+]