feat: organize uploads by folder + cdn.hotelsync.ru active

- Upload route now accepts ?folder=categories|rooms|hotels|guests
- Files saved to /uploads/{folder}/uuid.ext, served at cdn.hotelsync.ru/{folder}/uuid.ext
- api.upload.photo() accepts optional folder param (default: 'rooms')
- RoomCategoriesPage passes folder='categories' on photo upload
- SSL cert issued and nginx config active for cdn.hotelsync.ru

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

src/lib/api.ts

@@ -346,11 +346,11 @@ export const api = {
 
   // ── File Upload ───────────────────────────────────────────────────────────
   upload: {
-    photo: async (file: File): Promise<string> => {
+    photo: async (file: File, folder: 'categories' | 'rooms' | 'hotels' | 'guests' = 'rooms'): Promise<string> => {
       const token = localStorage.getItem('access_token')
       const fd = new FormData()
       fd.append('file', file)
-      const res = await fetch(`${BASE}/api/upload`, {
+      const res = await fetch(`${BASE}/api/upload?folder=${folder}`, {
         method: 'POST',
         headers: token ? { Authorization: `Bearer ${token}` } : {},
         body: fd,