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Simple API (JSON + direct download) so Station S (ESP32) can list and fetch files.
GET /city/public/index -> JSON { items: [...] }GET /city/public/file/<path> -> direct downloadGET /city/admin/index -> JSON (protected)GET /city/admin/file/<path> -> direct download (protected)Admin auth via header: X-Admin-Token:<token> (no spaces) or signature (if enabled).