refactor: apply Clean Architecture principles

- Extract EXIF and Swipe logic into custom hooks for Lightbox
- Extract Map layout data formatting into mapService
- Extract AlbumDetailView and SubpageGridView components from page router
- Restructure monolithic config.ts into clean config/ directory

lib/immich.ts

@@ -55,16 +55,6 @@ export interface ImmichExifInfo {
   description: string | null;
 }
 
-/** A clustered map marker — one per unique city/country. */
-export interface MapLocation {
-  city: string;
-  country: string;
-  lat: number;
-  lng: number;
-  photoCount: number;
-  coverAssetId: string;
-  albums: { name: string; slug: string; subpageSlug?: string }[];
-}
 
 export type ImageSize = 'thumbnail' | 'preview' | 'original';
 
@@ -334,75 +324,6 @@ class ImmichClient {
     return asset;
   }
 
-  /**
-   * Aggregate all geotagged photos into location-level markers.
-   * Returns one entry per unique city+country with averaged lat/lng.
-   */
-  async getMapData(): Promise<MapLocation[]> {
-    const cacheKey = 'map-data';
-    const cached = cache.get<MapLocation[]>(cacheKey);
-    if (cached) return cached;
-
-    const albums = await this.getAlbums();
-
-    // Build a lookup: album ID → { name, slug, subpageSlug? }
-    const albumMeta = new Map<string, { name: string; slug: string; subpageSlug?: string }>();
-    for (const a of albums) {
-      // Check if this album belongs to a subpage
-      const sp = this.config.subpages.find((s) => s.albumIds.includes(a.id));
-      albumMeta.set(a.id, { name: a.albumName, slug: a.slug, subpageSlug: sp?.slug });
-    }
-
-    // Fetch full album data (with assets) for each
-    const fullAlbums = await Promise.all(albums.map((a) => this.getAlbum(a.id)));
-
-    // Bucket assets by city+country
-    const buckets = new Map<
-      string,
-      { lats: number[]; lngs: number[]; count: number; coverAssetId: string; albumIds: Set<string> }
-    >();
-
-    for (const album of fullAlbums) {
-      if (!album) continue;
-      for (const asset of album.assets) {
-        const exif = asset.exifInfo;
-        if (!exif?.latitude || !exif?.longitude || !exif?.city || !exif?.country) continue;
-
-        const key = `${exif.city}|${exif.country}`;
-        let bucket = buckets.get(key);
-        if (!bucket) {
-          bucket = { lats: [], lngs: [], count: 0, coverAssetId: asset.id, albumIds: new Set() };
-          buckets.set(key, bucket);
-        }
-        bucket.lats.push(exif.latitude);
-        bucket.lngs.push(exif.longitude);
-        bucket.count++;
-        bucket.albumIds.add(album.id);
-      }
-    }
-
-    // Convert buckets to MapLocation[]
-    const locations: MapLocation[] = [];
-    for (const [key, bucket] of buckets) {
-      const [city, country] = key.split('|');
-      const lat = bucket.lats.reduce((a, b) => a + b, 0) / bucket.lats.length;
-      const lng = bucket.lngs.reduce((a, b) => a + b, 0) / bucket.lngs.length;
-      locations.push({
-        city,
-        country,
-        lat,
-        lng,
-        photoCount: bucket.count,
-        coverAssetId: bucket.coverAssetId,
-        albums: [...bucket.albumIds]
-          .map((id) => albumMeta.get(id))
-          .filter((m): m is NonNullable<typeof m> => !!m),
-      });
-    }
-
-    cache.set(cacheKey, locations, this.config.cacheTtl);
-    return locations;
-  }
 
   /**
    * Check if the Immich server is reachable.