feat: Migrate from Socket.IO to Server-Sent Events (SSE)

- Replace Socket.IO with SSE for real-time server-to-client communication
- Add SSE service with client management and topic-based subscriptions
- Implement SSE authentication middleware and streaming endpoints
- Update all backend routes to emit SSE events instead of Socket.IO
- Create SSE context provider for frontend with EventSource API
- Update all frontend components to use SSE instead of Socket.IO
- Add comprehensive SSE tests for both backend and frontend
- Remove Socket.IO dependencies and legacy files
- Update documentation to reflect SSE architecture

Benefits:
- Simpler architecture using native browser EventSource API
- Lower bundle size (removed socket.io-client dependency)
- Better compatibility with reverse proxies and load balancers
- Reduced resource usage for Raspberry Pi deployment
- Standard HTTP-based real-time communication

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

node_modules/playwright-core/lib/client/webSocket.js

@@ -0,0 +1,93 @@
+"use strict";
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+var webSocket_exports = {};
+__export(webSocket_exports, {
+  connectOverWebSocket: () => connectOverWebSocket
+});
+module.exports = __toCommonJS(webSocket_exports);
+var import_connection = require("./connection");
+async function connectOverWebSocket(parentConnection, params) {
+  const localUtils = parentConnection.localUtils();
+  const transport = localUtils ? new JsonPipeTransport(localUtils) : new WebSocketTransport();
+  const connectHeaders = await transport.connect(params);
+  const connection = new import_connection.Connection(parentConnection._platform, localUtils, parentConnection._instrumentation, connectHeaders);
+  connection.markAsRemote();
+  connection.on("close", () => transport.close());
+  let closeError;
+  const onTransportClosed = (reason) => {
+    connection.close(reason || closeError);
+  };
+  transport.onClose((reason) => onTransportClosed(reason));
+  connection.onmessage = (message) => transport.send(message).catch(() => onTransportClosed());
+  transport.onMessage((message) => {
+    try {
+      connection.dispatch(message);
+    } catch (e) {
+      closeError = String(e);
+      transport.close().catch(() => {
+      });
+    }
+  });
+  return connection;
+}
+class JsonPipeTransport {
+  constructor(owner) {
+    this._owner = owner;
+  }
+  async connect(params) {
+    const { pipe, headers: connectHeaders } = await this._owner._channel.connect(params);
+    this._pipe = pipe;
+    return connectHeaders;
+  }
+  async send(message) {
+    await this._pipe.send({ message });
+  }
+  onMessage(callback) {
+    this._pipe.on("message", ({ message }) => callback(message));
+  }
+  onClose(callback) {
+    this._pipe.on("closed", ({ reason }) => callback(reason));
+  }
+  async close() {
+    await this._pipe.close().catch(() => {
+    });
+  }
+}
+class WebSocketTransport {
+  async connect(params) {
+    this._ws = new window.WebSocket(params.wsEndpoint);
+    return [];
+  }
+  async send(message) {
+    this._ws.send(JSON.stringify(message));
+  }
+  onMessage(callback) {
+    this._ws.addEventListener("message", (event) => callback(JSON.parse(event.data)));
+  }
+  onClose(callback) {
+    this._ws.addEventListener("close", () => callback());
+  }
+  async close() {
+    this._ws.close();
+  }
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  connectOverWebSocket
+});