add order timeline API: step names + estimated business-day completion dates per service

GET /api/v1/order-timeline/:order_id — returns steps with dates:
- Skips weekends + US federal holidays (matches business_days.py)
- Per-service timelines: MCS-150 (2 days), BOC-3 (3 days), MC Auth (15 days), etc
- Entity upgrade bundle shows full sequential pipeline (10 business days)
- ETA emergency shows same-day processing

api/src/index.ts

@@ -48,6 +48,7 @@ import pucRouter from "./routes/puc.js";
 import fccCarrierRegRouter from "./routes/fcc-carrier-registration.js";
 import dotLookupRouter from "./routes/dot-lookup.js";
 import surveyRouter from "./routes/survey.js";
+import orderTimelineRouter from "./routes/order-timeline.js";
 
 const app = express();
 
@@ -122,6 +123,7 @@ app.use(pucRouter);
 app.use(fccCarrierRegRouter);
 app.use(dotLookupRouter);
 app.use(surveyRouter);
+app.use(orderTimelineRouter);
 app.use(adminCryptoRouter);
 // Note: identityRouter mounted above express.json() for webhook route,
 // but also handles non-webhook routes (create-session, poll) which work fine with json()