feat: add room-planner app — 3-day HK room view with NewBook integration

NewBook-connected daily housekeeping planner. Replaces the hotelhubmodule-housekeeping-dailylist
WordPress plugin. LXC 120 · 10.10.10.120:3080 · slug: room-planner.

- 3-day booking window (yesterday/today/tomorrow) fetched live from NewBook
- Task completion ticks back to NewBook; room status patches NewBook directly
- 23px border sliver CSS system for adjacent-day booking status
- 3-state filter cycling (off→inclusive→exclusive) for categories and flow types
- Stat filters for outstanding tasks and clean/dirty status
- Rolling 48h activity log with checkout/checkin/status/tasks events
- newbook_pings event bus for future NewBook poller integration
- Room modal with permission-gated guest/rate/notes, task checkboxes, status buttons
- Placeholder sections for future linen-count and routine-tasks modules
- Settings page: task type colours, twin/extra-bed detection, category exclusions
- Mobile-first layout (sidebar desktop, compact top bar mobile)

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

backend/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "hnf-room-planner-backend",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "node --watch src/index.js"
+  },
+  "dependencies": {
+    "@fastify/cookie": "^9.4.0",
+    "@fastify/cors": "^9.0.1",
+    "fastify": "^4.28.1",
+    "jose": "^5.9.6",
+    "pg": "^8.13.1"
+  }
+}