feat(backend): implement REST API for races calendar

Express + TypeScript backend with PostgreSQL: CRUD endpoints for /races (GET list with year/month filters, GET by id, POST, PATCH, DELETE), health/readiness probes, SQL migration runner, seed script with upsert from CSV, camelCase/snake_case mapper, CORS, env validation, docker-compose, and API docs for frontend.

Made-with: Cursor

backend/src/routes/health.ts

@@ -0,0 +1,19 @@
+import { Router, Request, Response } from "express";
+import { checkDbConnection } from "../db";
+
+const router = Router();
+
+router.get("/health", (_req: Request, res: Response) => {
+  res.json({ status: "ok" });
+});
+
+router.get("/ready", async (_req: Request, res: Response) => {
+  const dbOk = await checkDbConnection();
+  if (dbOk) {
+    res.json({ status: "ready", db: "connected" });
+  } else {
+    res.status(503).json({ error: "database_unavailable", db: "disconnected" });
+  }
+});
+
+export default router;