feat(places): photo map view (MapLibre + PMTiles, Approach A)

Adds a Places tab to the Photos section: a self-hosted MapLibre GL map of
the user's geotagged photos.

- places.js: lazy-loads vendored MapLibre + pmtiles.js on first open; draws
  the server-aggregated clusters (GET /api/photos/geo) as HTML thumbnail
  markers (no glyphs/sprites, no client-side clustering); pan/zoom refetches
  for the new viewport; click a cluster to zoom in, or a single photo to
  open it in the lightbox.
- Optional vector basemap read directly from /basemaps/basemap.pmtiles over
  HTTP Range (label-light Protomaps style, light/dark aware); falls back to
  a themed background when no basemap is present. ODbL attribution shown.
- "Moments | Places" sub-nav wired into the Photos section.
- enable_places now defaults on, since the route + UI are ready.

No new backend serving code: tower-http ServeDir already serves static/
with Range, so the .pmtiles basemap is just a static file.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JW6ghFMDtnRYuYNzZhb47M

src/common/config.rs

@@ -895,7 +895,7 @@ impl Default for FeaturesConfig {
             enable_trash: true,        // Enable trash feature
             enable_search: true,       // Enable search feature
             enable_music: true,        // Enable music feature
-            enable_places: false,      // Photo map; off until the map UI ships
+            enable_places: true,       // Photo map (GET /api/photos/geo + Places tab)
             expose_system_users: true, // Expose OxiCloud users as address book by default
         }
     }