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.

scripts/check-syntax.js

@@ -0,0 +1,20 @@
+const { readdirSync, statSync } = require("fs");
+const { join } = require("path");
+const { spawnSync } = require("child_process");
+
+const ignored = new Set(["node_modules", ".git", "coverage"]);
+const files = [];
+const walk = (directory) => {
+  for (const name of readdirSync(directory)) {
+    if (ignored.has(name)) continue;
+    const target = join(directory, name);
+    if (statSync(target).isDirectory()) walk(target);
+    else if (name.endsWith(".js")) files.push(target);
+  }
+};
+walk(process.cwd());
+for (const file of files) {
+  const result = spawnSync(process.execPath, ["--check", file], { stdio: "inherit" });
+  if (result.status !== 0) process.exit(result.status || 1);
+}
+console.log(`Syntax check passed for ${files.length} JavaScript files.`);