Remove pull integration; persist push log to DB (last 50 per hotel)

- Remove TravelLine/netup-pms pull route (travelline.ts unused)
- Remove pull integration section from TvWelcomePage (token field, API URL, etc.)
- Migration 008: netup_push_log table (hotel_id, action, status, request/response body)
- recordPush() now writes to DB in addition to in-memory buffer
- getLog reads from DB so logs survive server restarts
- clearLog deletes from DB
- Limit enforced: 50 rows per hotel (oldest auto-deleted)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/app.ts

@@ -16,7 +16,6 @@ import housekeepingRoutes from './routes/housekeeping'
 import channelsRoutes    from './routes/channels'
 import usersRoutes       from './routes/users'
 import netupRoutes       from './routes/netup'
-import travellineRoutes  from './routes/travelline'
 
 export async function buildApp() {
   const fastify = Fastify({
@@ -74,7 +73,6 @@ export async function buildApp() {
   await fastify.register(channelsRoutes)
   await fastify.register(usersRoutes)
   await fastify.register(netupRoutes)
-  await fastify.register(travellineRoutes)
 
   return fastify
 }