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>

scripts/workers/services/__init__.py

@@ -99,6 +99,7 @@ FCC_SERVICE_SLUGS: frozenset[str] = frozenset({
     "fcc-499a",
     "fcc-499a-zero",
     "fcc-499a-499q",
+    "fcc-499q",
     "stir-shaken",
     "bdc-filing",
     "fcc-full-compliance",