Add multi-service Docker setup, Postgres migrations, and messaging API cleanup

deployment/frontend/Dockerfile

@@ -33,7 +33,10 @@ RUN npm run build
 # 3. Put it all together
 FROM node:24-slim
 
-# 3.1. Non-root user
+# 3.1. Install curl for health checks
+RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
+
+# 3.2. Non-root user
 RUN useradd -u 1001 app && \
     mkdir -p /app && \
     chown -R app /app && \

deployment/frontend/server.ts

@@ -5,6 +5,7 @@ import { resolve } from 'path';
 const app = express();
 const port = process.env.PORT || 3000;
 const backendHost = process.env.BACKEND_HOST || "http://localhost:8300";
+const fileStorageHost = process.env.FILE_STORAGE_HOST || "http://localhost:8302";
 const filePath = process.env.STATIC_FILE_PATH || ".";
 
 // API proxy middleware
@@ -15,6 +16,12 @@ app.use('/api', createProxyMiddleware({
     ws: true
 }));
 
+// File serving proxy middleware
+app.use('/uploads/files', createProxyMiddleware({
+    target: fileStorageHost,
+    changeOrigin: true
+}));
+
 // Serve static files
 app.use(express.static(resolve(filePath)));