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.

compose.yaml

@@ -0,0 +1,59 @@
+services:
+  api:
+    build: .
+    command: node server.js
+    env_file: .env
+    environment:
+      DB_HOST: mysql
+      REDIS_HOST: redis
+    ports:
+      - "${PORT:-3070}:${PORT:-3070}"
+    depends_on:
+      mysql:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+
+  worker:
+    build: .
+    command: node app/workers/index.js
+    env_file: .env
+    environment:
+      DB_HOST: mysql
+      REDIS_HOST: redis
+      RUN_CRON: "false"
+    depends_on:
+      mysql:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+
+  mysql:
+    image: mysql:8.4
+    environment:
+      MYSQL_DATABASE: ${DB_NAME}
+      MYSQL_USER: ${DB_USER}
+      MYSQL_PASSWORD: ${DB_PASSWORD}
+      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
+    volumes:
+      - mysql-data:/var/lib/mysql
+    healthcheck:
+      test: ["CMD-SHELL", "mysqladmin ping -h 127.0.0.1 -u root -p$$MYSQL_ROOT_PASSWORD --silent"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+
+  redis:
+    image: redis:7.4-alpine
+    command: ["redis-server", "--requirepass", "${REDIS_PASSWORD}"]
+    volumes:
+      - redis-data:/data
+    healthcheck:
+      test: ["CMD-SHELL", "redis-cli -a $$REDIS_PASSWORD ping | grep PONG"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+
+volumes:
+  mysql-data:
+  redis-data: