feat(fc2c-i): artist overview + paged images endpoints

backend/app/api/artist.py

@@ -0,0 +1,36 @@
+"""Artist API: overview aggregates + paged images."""
+
+from quart import Blueprint, jsonify, request
+
+from ..extensions import get_session
+from ..services.artist_service import ArtistService
+
+artist_bp = Blueprint("artist", __name__, url_prefix="/api/artist")
+
+
+@artist_bp.route("/<slug>", methods=["GET"])
+async def overview(slug: str):
+    async with get_session() as session:
+        svc = ArtistService(session)
+        data = await svc.overview(slug)
+    if data is None:
+        return jsonify({"error": "artist not found"}), 404
+    return jsonify(data)
+
+
+@artist_bp.route("/<slug>/images", methods=["GET"])
+async def images(slug: str):
+    cursor = request.args.get("cursor") or None
+    try:
+        limit = int(request.args.get("limit", "60"))
+    except ValueError:
+        return jsonify({"error": "limit must be an integer"}), 400
+    async with get_session() as session:
+        svc = ArtistService(session)
+        try:
+            page = await svc.images(slug, cursor=cursor, limit=limit)
+        except ValueError as exc:
+            return jsonify({"error": str(exc)}), 400
+    if page is None:
+        return jsonify({"error": "artist not found"}), 404
+    return jsonify({"images": page.images, "next_cursor": page.next_cursor})