feat(trip-cluster): config, factory, CLI skeleton, health + thumb proxy

apps/trip-cluster/app/routes/proxy.py

@@ -0,0 +1,14 @@
+import os
+from flask import Blueprint, current_app, send_file, abort
+
+bp = Blueprint("proxy", __name__)
+
+
+@bp.route("/thumb/<asset_id>")
+def thumb(asset_id):
+    cfg = current_app.config["APP_CONFIG"]
+    safe = os.path.basename(asset_id)
+    path = os.path.join(cfg.thumbs_dir, f"{safe}.jpg")
+    if not os.path.exists(path):
+        abort(404)
+    return send_file(path, mimetype="image/jpeg")