feat(travel-proxy): albums API에 region/regionName 필드 추가

앨범 커버 지정이 프론트에 반영되도록 albums API 응답에
region, regionName 포함. region_map 역인덱스 + GeoJSON name 매핑.

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

travel-proxy/app/main.py

@@ -180,12 +180,36 @@ def sync_endpoint():
 @app.get("/api/travel/albums")
 def albums_list():
     rows = get_all_albums()
+    region_map = load_region_map()
+
+    # album → region 역인덱스
+    album_to_region = {}
+    for region_id, v in region_map.items():
+        album_list = v if isinstance(v, list) else v.get("albums", [])
+        for a in album_list:
+            album_to_region[a] = region_id
+
+    # region → name 매핑 (GeoJSON)
+    region_names = {}
+    try:
+        geojson = load_regions_geojson()
+        for feat in geojson.get("features", []):
+            props = feat.get("properties", {})
+            rid = props.get("id")
+            if rid:
+                region_names[rid] = props.get("name", rid)
+    except Exception:
+        pass
+
     result = []
     for r in rows:
         cover = r["cover_filename"]
+        region_id = album_to_region.get(r["album"], "미분류")
         result.append({
             "album": r["album"],
             "count": r["count"],
+            "region": region_id,
+            "regionName": region_names.get(region_id, region_id),
             "cover_url": f"{MEDIA_BASE}/{r['album']}/{cover}",
             "cover_thumb": f"{MEDIA_BASE}/.thumb/{r['album']}/{cover}",
         })