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/db.config.js

@@ -12,10 +12,10 @@
 require("dotenv").config();
 
 module.exports = {
-  HOST: process.env.DB_HOST || "localhost",
-  USER: process.env.DB_USER || "root",
-  PASSWORD: process.env.DB_PASSWORD || "",
-  DB: process.env.DB_NAME || "oceanic-db",
+  HOST: process.env.DB_HOST,
+  USER: process.env.DB_USER,
+  PASSWORD: process.env.DB_PASSWORD,
+  DB: process.env.DB_NAME,
   PORT: process.env.DB_PORT || 3306,
   DIALECT: "mysql",