feat: web server with REST API, captive portal, and management UI

Co-authored-by: Cursor <cursoragent@cursor.com>

src/web_server.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <Arduino.h>
+#include <ESPAsyncWebServer.h>
+#include <functional>
+#include "settings.h"
+
+class ImmichClient;
+class PowerManager;
+class WiFiManager;
+
+class AppWebServer {
+public:
+    void begin(SettingsManager& settings, ImmichClient& immich,
+               PowerManager& power, WiFiManager& wifi);
+    void setActionCallback(std::function<void(const String& action)> cb);
+    bool isOTAInProgress();
+
+private:
+    AsyncWebServer _server{80};
+    SettingsManager* _settings = nullptr;
+    ImmichClient* _immich = nullptr;
+    PowerManager* _power = nullptr;
+    WiFiManager* _wifi = nullptr;
+    std::function<void(const String& action)> _actionCb;
+    bool _otaInProgress = false;
+
+    void setupCaptivePortal();
+    void setupAPIRoutes();
+    void setupStaticFiles();
+    void setupOTA();
+
+    void handleGetStatus(AsyncWebServerRequest* request);
+    void handleGetAlbums(AsyncWebServerRequest* request);
+    void handlePostAlbumsSelect(AsyncWebServerRequest* request, uint8_t* data, size_t len);
+    void handleGetSettings(AsyncWebServerRequest* request);
+    void handlePostSettings(AsyncWebServerRequest* request, uint8_t* data, size_t len);
+    void handlePostAction(AsyncWebServerRequest* request);
+    void handlePostSetup(AsyncWebServerRequest* request, uint8_t* data, size_t len);
+};