Feat: Hybrid Architecture Phase 1

- Implemented Game Server (game-server.js) with Socket.io
- Added JSON Schemas for Campaigns and Missions
- Updated Docker configurations for multi-service setup
- Refactored main.js to allow local network connections
- Removed legacy code (main_old.js)
- Updated dependencies

game-server.js

@@ -0,0 +1,81 @@
+import express from 'express';
+import { createServer } from 'http';
+import { Server } from 'socket.io';
+import { fileURLToPath } from 'url';
+import { dirname, join } from 'path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const app = express();
+const httpServer = createServer(app);
+const io = new Server(httpServer, {
+    cors: {
+        origin: "*", // Allow connections from any mobile device on local network
+        methods: ["GET", "POST"]
+    }
+});
+
+// Serve static files from 'dist' (production) or 'public' (dev partial)
+// In a real setup, Vite handles dev serving, but this server handles the sockets.
+app.use(express.static(join(__dirname, 'dist')));
+
+// Game State Storage (In-Memory for now)
+const LOBBIES = {
+    // "lobbyCode": { hostSocket: id, players: [{id, name, charId}] }
+};
+
+io.on('connection', (socket) => {
+    console.log('Client connected:', socket.id);
+
+    // --- HOST EVENTS (PC) ---
+    socket.on('HOST_GAME', () => {
+        const lobbyCode = generateLobbyCode();
+        LOBBIES[lobbyCode] = {
+            hostSocket: socket.id,
+            players: []
+        };
+        socket.join(lobbyCode);
+        socket.emit('LOBBY_CREATED', { code: lobbyCode });
+        console.log(`Lobby ${lobbyCode} created by ${socket.id}`);
+    });
+
+    // --- PLAYER EVENTS (MOBILE) ---
+    socket.on('JOIN_GAME', ({ code, name }) => {
+        const lobby = LOBBIES[code.toUpperCase()];
+        if (lobby) {
+            lobby.players.push({ id: socket.id, name, charId: null });
+            socket.join(code.toUpperCase());
+
+            // Notify Host
+            io.to(lobby.hostSocket).emit('PLAYER_JOINED', { id: socket.id, name });
+            // Confirm to Player
+            socket.emit('JOIN_SUCCESS', { code: code.toUpperCase() });
+            console.log(`Player ${name} joined lobby ${code}`);
+        } else {
+            socket.emit('ERROR', { message: "Lobby not found" });
+        }
+    });
+
+    socket.on('PLAYER_ACTION', ({ code, action, data }) => {
+        const lobby = LOBBIES[code];
+        if (lobby) {
+            // Forward directly to Host
+            io.to(lobby.hostSocket).emit('PLAYER_ACTION', { playerId: socket.id, action, data });
+        }
+    });
+
+    socket.on('disconnect', () => {
+        console.log('Client disconnected:', socket.id);
+        // Handle cleanup (remove player from lobby, notify host)
+    });
+});
+
+function generateLobbyCode() {
+    return Math.random().toString(36).substring(2, 6).toUpperCase();
+}
+
+const PORT = 3001;
+httpServer.listen(PORT, () => {
+    console.log(`Game Server running on http://localhost:${PORT}`);
+});