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.

deployment/nginx/zumri-api.conf.example

@@ -0,0 +1,22 @@
+upstream zumri_api {
+    server 127.0.0.1:3070;
+    keepalive 32;
+}
+
+server {
+    listen 80;
+    server_name api.example.com;
+    client_max_body_size 6m;
+
+    location / {
+        proxy_pass http://zumri_api;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_connect_timeout 10s;
+        proxy_read_timeout 60s;
+        proxy_send_timeout 60s;
+    }
+}