feat(deriv): integrate Deriv API websocket connectivity

Add Deriv API websocket client, route handling, and Firestore security rules to support automated trading integration.

server.ts

@@ -11,6 +11,8 @@ const MetaApi = typeof MetaApiPkg === "function" ? MetaApiPkg : (MetaApiPkg as a
 import { db } from "./src/lib/firebase";
 import { doc, getDoc, setDoc, addDoc, collection, runTransaction, query, where, getDocs, updateDoc, orderBy, limit } from "firebase/firestore";
 
+import derivRoutes from "./src/routes/deriv.routes.ts";
+
 async function startServer() {
   const app = express();
   const PORT = 3000;
@@ -22,6 +24,9 @@ async function startServer() {
     res.json({ status: "ok" });
   });
 
+  // Mount Deriv Routes
+  app.use("/api/deriv", derivRoutes);
+
   // --- BACKGROUND WORKER NODE (CRON JOB) ---
   function getYfSymbol(pair: string): string {
   if (pair.includes('XAU')) return 'GC=F';