Implement full NFC-URL streaming architecture

- rc522: add NDEF URL reading via WUPA+cascade anticoll+SELECT+TLV parse
- AudioPlayer: route http:// URIs to esp_player_http_music_play()
- CacheManager: download URLs async to /sdcard/cache/{hash}.{ext}
- TagPlayerControl: NDEF URL → cache-or-stream; fallback to UID local mapping
- RFIDInterface: wire ndef_callback, expose combined uid+url callback
- WebInterface: add /api/info, /api/storage, /api/playback, /api/bluetooth
- BluetoothInterface: stub for A2DP speaker mode
- Networking: WiFi connect with 30s timeout instead of blocking forever
- main.cpp: re-enable WiFi + web server, fix init order, add CacheManager
- www/: full SPA — playback controls, device info, storage, BT pairing
- .gitmodules: switch rc522 submodule URL to HTTPS

https://claude.ai/code/session_01MhAnh68DPNnTjcKqjNYDmk

device/main/RFIDInterface.hpp

@@ -6,13 +6,21 @@
 #include "WebInterface.hpp"
 
 class RFIDInterface {
-	rc522_start_args_t startConfig;
+    rc522_start_args_t startConfig;
 
-	public:
-		RFIDInterface();
-		void start();
-		void registerWebResources(WebInterface* interface);
-		void registerTagChangeCallback(std::function<void(char*)>);
+public:
+    RFIDInterface();
+    void start();
+    void registerWebResources(WebInterface* interface);
+
+    /* Callback receives (uid_string, url_or_null):
+     *   uid == NULL  → tag removed
+     *   url == NULL  → tag placed but no NDEF URI found (use uid for local lookup)
+     *   url != NULL  → tag placed with NDEF URI */
+    void registerTagCallback(std::function<void(const char* uid, const char* url)> cb);
+
+    /* Legacy: only fires with UID string (NULL on removal). Kept for compatibility. */
+    void registerTagChangeCallback(std::function<void(char*)> cb);
 };
 
-#endif
+#endif