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/AudioPlayer.hpp

@@ -1,16 +1,29 @@
 #pragma once
 
 #include <string>
+#include <esp_player_wrapper.h>
 
 class AudioPlayer {
-	void* playerHandle;
-	std::string lastUri;
+    void* playerHandle;
+    std::string lastUri;
 
-	public:
-		AudioPlayer();
-		void play(std::string uri);
-		void pause();
+public:
+    AudioPlayer();
 
-	private:
-		bool isLastUri(std::string uri);
-};
+    /* Play URI. http:// / https:// URIs stream via HTTP; anything else plays from SD card.
+     * Re-placing the same URI resumes rather than restarting. */
+    void play(const std::string& uri);
+
+    void pause();
+    void stop();
+
+    int  getVolume();
+    void setVolume(int vol);
+
+    bool isPlaying() const;
+    const std::string& getCurrentUri() const { return lastUri; }
+
+private:
+    bool isHttpUri(const std::string& uri) const;
+    bool isLastUri(const std::string& uri) const;
+};