Improve NetUP diagnostics: push event log + test check-in button

- notifyNetupCheckin/Checkout now log every attempt (ok/error/skipped)
  with room number, NetUP room, URL, HTTP status, error message
- Push log exposed via GET /netup/log alongside pull request log
- New POST /netup/test-checkin: manually trigger a test check-in from UI
- Diagnostics tab split into two sections:
  - Outgoing (push): table of check-in/check-out events with status dots
  - Incoming (pull): NetUP poll requests (if TravelLine integration works)
- Test button picks first mapped room and fires a real check-in call

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

src/lib/api.ts

@@ -289,11 +289,16 @@ export const api = {
       req<{ ok: boolean }>('POST', `/api/hotels/${slug}/netup/message`, { room_id: roomId, message, guest_name: guestName }),
 
     getLog: (slug: string) =>
-      req<{ count: number; requests: { ts: string; method: string; url: string; headers: Record<string, unknown>; query: Record<string, unknown>; body: unknown }[] }>(
-        'GET', `/api/hotels/${slug}/netup/log`),
+      req<{
+        pushEvents: { ts: string; action: string; roomNumber: string; netupRoom: string; url: string; status: string; httpStatus?: number; error?: string }[]
+        pullRequests: { ts: string; method: string; url: string; headers: Record<string, unknown>; query: Record<string, unknown>; body: unknown }[]
+      }>('GET', `/api/hotels/${slug}/netup/log`),
 
     clearLog: (slug: string) =>
       req<{ ok: boolean }>('DELETE', `/api/hotels/${slug}/netup/log`),
+
+    testCheckin: (slug: string, roomId: string) =>
+      req<{ ok: boolean; message: string }>('POST', `/api/hotels/${slug}/netup/test-checkin`, { room_id: roomId }),
   },
 }