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/s3.config.js

@@ -1,22 +1,11 @@
-/**
- * Copyright (c) 2026 Niolla
- * All rights reserved.
- *
- * This source code is proprietary and confidential.
- * Unauthorized copying, modification, distribution, or use
- * of this file, via any medium, is strictly prohibited.
- */
+const { S3Client } = require("@aws-sdk/client-s3");
 
-// app/config/s3.config.js
-
-// const { S3Client } = require("@aws-sdk/client-s3");
-
-// const s3 = new S3Client({
-//   region: process.env.AWS_REGION,
-//   credentials: {
-//     accessKeyId: process.env.AWS_ACCESS_KEY_ID,
-//     secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
-//   },
-// });
-
-// module.exports = s3;
+module.exports = process.env.ENABLE_S3 === "true"
+  ? new S3Client({
+      region: process.env.AWS_REGION,
+      credentials: {
+        accessKeyId: process.env.AWS_ACCESS_KEY_ID,
+        secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
+      },
+    })
+  : { send: async () => { throw new Error("S3 functionality is not enabled"); } };