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/cdpSession.js

@@ -0,0 +1,51 @@
+"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 cdpSession_exports = {};
+__export(cdpSession_exports, {
+  CDPSession: () => CDPSession
+});
+module.exports = __toCommonJS(cdpSession_exports);
+var import_channelOwner = require("./channelOwner");
+class CDPSession extends import_channelOwner.ChannelOwner {
+  static from(cdpSession) {
+    return cdpSession._object;
+  }
+  constructor(parent, type, guid, initializer) {
+    super(parent, type, guid, initializer);
+    this._channel.on("event", ({ method, params }) => {
+      this.emit(method, params);
+    });
+    this.on = super.on;
+    this.addListener = super.addListener;
+    this.off = super.removeListener;
+    this.removeListener = super.removeListener;
+    this.once = super.once;
+  }
+  async send(method, params) {
+    const result = await this._channel.send({ method, params });
+    return result.result;
+  }
+  async detach() {
+    return await this._channel.detach();
+  }
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  CDPSession
+});