feat: stabilize API startup and lifecycle management

- Refactor server initialization to separate concerns and improve error handling.
- Implement centralized environment validation using Zod.
- Introduce database, Redis, and queue lifecycle management.
- Add health check endpoints for liveness and readiness.
- Enhance error handling middleware for better response structure.
- Implement rate limiting for API endpoints.
- Add request ID middleware for traceability.
- Create Sequelize CLI configuration and baseline migration for schema management.
- Establish CI workflow with Gitea for testing and syntax checks.
- Document foundational changes and migration strategy in PHASE_0_FOUNDATION_STABILIZATION.md.
- Add Docker Compose configuration for local development and testing.
- Implement unit and integration tests for critical functionality.

app/config/queue.lifecycle.js

@@ -0,0 +1,9 @@
+const activityQueue = require("../queues/activity.queue");
+const documentQueue = require("../queues/document.queue");
+const logQueue = require("../queues/log.queue");
+
+const closeQueues = async () => {
+  await Promise.allSettled([activityQueue.close(), documentQueue.close(), logQueue.close()]);
+};
+
+module.exports = { closeQueues };