feat: photos for tech tasks, 3 priorities, remove cleaning status from context menu

- Remove 'Убирается' (cleaning) from manually selectable HK statuses in calendar context menu — it now only shows automatically when a task is in_progress
- Reduce priorities from 4 to 3: remove 'high', keep urgent/medium/low across context menu, tech tasks modal, and HousekeepingTask type
- Add photo upload to technical tasks: upload via camera button per task, display thumbnails with hover-to-remove, stored as TEXT[] in DB (migration 026)
- Fix HousekeepingPage WS handler to filter by category — no longer adds maintenance tasks to housekeeping board
- Add 'tasks' folder support to upload route

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

src/lib/api.ts

@@ -362,7 +362,7 @@ export const api = {
 
   // ── File Upload ───────────────────────────────────────────────────────────
   upload: {
-    photo: async (file: File, folder: 'categories' | 'rooms' | 'hotels' | 'guests' = 'rooms'): Promise<string> => {
+    photo: async (file: File, folder: 'categories' | 'rooms' | 'hotels' | 'guests' | 'tasks' = 'rooms'): Promise<string> => {
       const token = getToken()
       const fd = new FormData()
       fd.append('file', file)
@@ -555,7 +555,7 @@ function toBookingPayload(b: Partial<BookingPayload>): Record<string, unknown> {
 export interface HkPayload {
   room_id?: string; type?: string; priority?: string
   status?: string; assignee_id?: string; notes?: string; due_date?: string
-  category?: string
+  category?: string; photos?: string[]
 }
 
 export interface HkSettings {