50-state trucking compliance: services, checker, order page, CA landing

- Migration 079: state_trucking_requirements table seeded for all 51 jurisdictions
  (IRP, IFTA, weight-distance taxes, MCP/CARB, intrastate authority, state DOT)
- Migration 080: carrier_operating_states tracking table
- 13 new state trucking services in catalog ($99-$599)
- StateTruckingHandler with state-specific admin todos
- DOT compliance checker: 7 new state-level checks (IRP, IFTA, weight tax,
  MCP/CARB, emissions, intrastate authority, state DOT number)
- New API endpoint: GET /api/v1/dot/state-requirements
- DOT order page: state compliance service cards with auto-preselect
- California trucking landing page (MCP + CARB + IRP + IFTA)
- Fix: DOT checker nav missing Trucking/DOT section
- Fix: All 8 DOT intake pages missing style block (dangling text)
- Fix: DOT confirmation email now says "Order Confirmed" not "Action Required"
- Fix: MCS150/BOC3/StateTrucking handlers missing async process() method
- Fix: StateTruckingHandler connection leak + slug resolution

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

scripts/workers/services/mcs150_update.py

@@ -56,6 +56,11 @@ class MCS150UpdateHandler:
     SERVICE_SLUG = "mcs150-update"
     SERVICE_NAME = "MCS-150 Biennial Update"
 
+    async def process(self, order_data: dict) -> list[str]:
+        """Entry point called by job_server. Delegates to handle()."""
+        order_number = order_data.get("order_number", order_data.get("name", ""))
+        return self.handle(order_data, order_number)
+
     def handle(self, order_data: dict, order_number: str) -> list[str]:
         """
         Process an MCS-150 update order.