Prepare application for production deployment with Docker and PostgreSQL

Integrate PostgreSQL database support, add Docker deployment configurations, and implement health check endpoints.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ceced2fc-aa46-458d-ba87-ddd4b7bb1518
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/659922a9-0087-461c-90dd-6d9a58b81d4d/ceced2fc-aa46-458d-ba87-ddd4b7bb1518/ahHWEFX

server/routes.ts

@@ -4,6 +4,11 @@ import { storage } from "./storage";
 import { insertLabelSchema, insertTaskSchema } from "@shared/schema";
 
 export async function registerRoutes(app: Express): Promise<Server> {
+  // Health check endpoint
+  app.get("/api/health", (req, res) => {
+    res.status(200).json({ status: "ok", timestamp: new Date().toISOString() });
+  });
+
   // Labels API routes
   app.get("/api/labels", async (req, res) => {
     try {