feat(backend): initial setup for cms backend service

backend/src/config/database.ts

@@ -0,0 +1,15 @@
+import { drizzle } from 'drizzle-orm/better-sqlite3';
+import Database from 'better-sqlite3';
+import * as schema from '../db/schema.js';
+import { env } from './env.js';
+
+if (!env.DATABASE_PATH) {
+  throw new Error('DATABASE_PATH environment variable is not set');
+}
+
+const sqlite = new Database(env.DATABASE_PATH);
+
+// Enable WAL mode for better concurrent access
+sqlite.pragma('journal_mode = WAL');
+
+export const db = drizzle(sqlite, { schema });