Implement 499-Q quarterly filing lifecycle

After 499-A+Q bundle is filed, the handler now creates actual
compliance_orders for each remaining quarterly 499-Q filing:

Schedule: Q1 due Feb 1, Q2 due May 1, Q3 due Aug 1, Q4 due Nov 1

Each quarterly order:
- Created as paid (covered by bundle price)
- Has due_date, quarter, period_end_date in intake_data
- Links to parent 499-A order
- Tracks reminder status (30d/14d/7d sent flags)

Notification worker (quarterly_499q_notify.py):
- Runs daily at 8am CT via systemd timer
- Sends HTML reminder emails at 30, 14, 7 days before due
- Email includes intake link for client to submit quarterly data
- Late warning at 7 days: "USAC may estimate higher contributions"
- Idempotent: won't re-send same reminder level

Added fcc-499q service slug ($0, not sold standalone).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/src/routes/compliance-orders.ts

@@ -142,6 +142,12 @@ const COMPLIANCE_SERVICES: Record<
     erpnext_item: "OCN-REGISTRATION",
     discountable: false,
   },
+  "fcc-499q": {
+    name: "FCC Form 499-Q Quarterly Filing",
+    price_cents: 0,  // included in 499-A+Q bundle — not sold standalone
+    erpnext_item: "FCC-499Q",
+    discountable: false,
+  },
   "fcc-499a-discontinuance": {
     name: "Form 499-A Discontinuance Filing",
     price_cents: 29900,