feat(phases-10-15): complete TapTrack Hub v1.0

Phase 10 — Support Ticket System:
- tickets.py router: SLA status (on_track/at_risk/breached/responded), email
  notifications on create+reply via background threads, school_name in list,
  priority filter, bulk-close endpoint
- tasks/tickets.py: escalate_stale Celery task (48h→high, 72h no reply→urgent)
- worker.py: escalate_stale scheduled every hour
- templates/email/ticket_notification.html: HTML ticket notification email
- TicketsPage.vue: status tabs, SLA badge, priority badge, school name column,
  checkbox bulk-close, pagination
- TicketDetailPage.vue: inline priority/status/assignee selectors, SLA timer,
  internal note lock icon, closed-ticket guard

Phase 11 — Monthly Report Generation:
- models/report.py: MonthlyReport + SchoolMonthlyStats ORM models
- tasks/reports.py: send_monthly_reports enhanced with SMS stats, attendance
  data, invoice summary, stores MonthlyReport record per school per month

Phase 12 — On-Prem Monthly Report Pull:
- tasks/reports.py: pull_monthly_stats task — httpx GET to each school's
  hub_base_url, upserts SchoolMonthlyStats; runs 1st at 5am
- worker.py: pull_monthly_stats scheduled 1st at 5am

Phase 13 — Feature Flags + Suspension:
- models/school.py: hub_base_url, feature_overrides (JSON), onboarding_completed_at
- routers/schools.py: PUT /{id}/feature-overrides endpoint
- routers/sync.py: _tier_features() merges school.feature_overrides into poll config

Phase 14 — Onboarding Wizard + Welcome Email:
- tasks/onboarding.py: send_welcome_email Celery task with license key
- routers/schools.py: auto-trigger welcome email on POST /schools,
  POST /{id}/activate (status→active + onboarding_completed_at),
  POST /{id}/resend-welcome

Phase 15 — UX Polish + Ops Tools:
- routers/search.py: GET /api/search?q= (schools + invoices + tickets, 5 each)
- routers/audit.py: GET /api/audit-logs (paginated, filterable)
- AppLayout.vue: global search bar with debounced dropdown, result navigation
- AuditLogsPage.vue: new page with filter + pagination
- AppSidebar.vue: Audit Logs nav item added
- router/index.ts: /audit-logs route
- api.ts: globalSearch, getAuditLogs, activateSchool, resendWelcomeEmail,
  updateFeatureOverrides, bulkCloseTickets

Deployment:
- docker-compose.yml: x-backend-env anchor (DRY), PDF_DIR env var,
  seed service (one-shot python seed.py on first boot)
- migrations/003_phases11_15.py: monthly_reports, school_monthly_stats tables
  + schools hub_base_url/feature_overrides/onboarding_completed_at columns

backend/app/routers/sync.py

@@ -14,12 +14,20 @@ from app.models.sms import SmsJob, SmsJobStatus, SmsCreditLedger, SmsCreditTx
 router = APIRouter(prefix="/api/sync", tags=["sync"])
 
 # Feature flags by tier — mirrors licenses.py
-def _tier_features(tier: str) -> dict:
+def _tier_features(tier: str, overrides: str | None = None) -> dict:
+    import json
     base = {"sms": True, "reports": True, "websocket": True, "multi_terminal": True}
     if tier == "premium":
         base.update({"api_keys": True, "webhooks": True, "bulk_enrollment": True})
     elif tier == "basic":
         base.update({"multi_terminal": False, "api_keys": False, "webhooks": False})
+    if overrides:
+        try:
+            base.update(json.loads(overrides))
+        except Exception:
+            pass
+    elif tier == "basic":
+        base.update({"multi_terminal": False, "api_keys": False, "webhooks": False})
     return base
 
 @router.post("/poll")
@@ -167,6 +175,6 @@ async def sync_poll(
             "sms_credits": float(school.sms_credits),
             "school_status": school.status.value,
             "suspended": suspended,
-            "feature_flags": _tier_features(lic.tier),
+            "feature_flags": _tier_features(lic.tier, school.feature_overrides),
         },
     }