feat(backend): initial setup for cms backend service

backend/drizzle.config.ts

@@ -0,0 +1,10 @@
+import type { Config } from 'drizzle-kit';
+
+export default {
+  schema: './src/db/schema.ts',
+  out: './src/db/migrations',
+  dialect: 'sqlite',
+  dbCredentials: {
+    url: process.env.DATABASE_PATH || './data/gallus_cms.db',
+  },
+} satisfies Config;