Refactor project to transition from Rust backend to Node.js with Fastify; update Dockerfile and Docker configurations for new build process; enhance local development instructions in CONTRIBUTING.md; implement health checks in Docker Compose; update pnpm-lock.yaml with new dependencies for API and shared packages; revise README.md to reflect new stack and development setup.

.cursor/rules/backend-testing.mdc

@@ -0,0 +1,26 @@
+---
+description: Backend Vitest + Fastify inject
+globs: apps/api/**/*,packages/db/**/*,packages/shared/**/*
+alwaysApply: false
+---
+
+# Backend Testing
+
+Vitest + `app.inject()` (встроено в Fastify).
+
+## Требования
+
+- Каждый route plugin → минимум 1 integration test
+- Sync/DNS → parity fixtures
+- `:memory:` SQLite для unit; file DB для integration
+- `beforeEach` — fresh schema migrate
+
+## Паттерн
+
+```ts
+const app = await buildApp({ db: testDb })
+const res = await app.inject({ method: 'GET', url: '/health' })
+expect(res.statusCode).toBe(200)
+```
+
+См. [`vitest-best-practices.mdc`](vitest-best-practices.mdc).