feat(phase-b): Supabase-first timetable, classes, enrollment, and student views

- timetable_builder_router: Supabase-primary slot write (POST /timetable/slots),
  week_cycle support, GET /slots reads from Supabase, materialize-periods endpoint,
  rebuild-neo4j endpoint, sync-lessons endpoint (Track B: TaughtLesson Neo4j nodes),
  _sync_teacher_timetables_to_neo4j and _sync_taught_lessons_to_neo4j helpers
- classes_router: GET /{class_id} enriched with profiles + enrollment_requests,
  GET /school/students for admin search, PATCH /enrollment-requests/{id} approve/reject
- taught_lessons_router: GET /student/lessons student week view with enrichment
- school_router: academic_periods sync, day-type management
- platform_admin_router + platform_admin: POST /admin/reset and /admin/seed endpoints
- invitations_router: teacher invite scaffolding
- reset_environment + seed_environment: idempotent dev environment scripts
- graph_tree_router: Supabase-first institute resolution
- provisioning_service: neo4j_private_db_name column support
- main.py + run/routers.py: register new routers

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

main.py

@@ -368,6 +368,7 @@ Startup modes:
   infra                    - Setup infrastructure (Neo4j schema, calendar, Supabase buckets)
   demo-school             - Create demo school (KevlarAI)
   demo-users              - Create demo users
+  seed-test               - Seed full test environment (2 schools, all test users)
   gais-data               - Import GAIS data (Edubase, etc.)
   dev                     - Run development server with auto-reload
   prod                    - Run production server (for Docker/containerized deployment)
@@ -376,7 +377,7 @@ Startup modes:
     
     parser.add_argument(
         '--mode', '-m',
-        choices=['infra', 'demo-school', 'demo-users', 'gais-data', 'dev', 'prod'],
+        choices=['infra', 'demo-school', 'demo-users', 'seed-test', 'gais-data', 'dev', 'prod'],
         default='dev',
         help='Startup mode (default: dev)'
     )
@@ -409,6 +410,13 @@ if __name__ == "__main__":
         success = run_demo_users_mode()
         sys.exit(0 if success else 1)
     
+    elif args.mode == 'seed-test':
+        from run.initialization.seed_test_environment import seed_test_environment
+        import json
+        result = seed_test_environment()
+        print(json.dumps(result, indent=2))
+        sys.exit(0 if result.get('success') else 1)
+
     elif args.mode == 'gais-data':
         # Run GAIS data import
         success = run_gais_data_mode()