feat: add Zod validation and English translations

- Add validation schemas for all admin endpoints
- Add English (en.json) i18n translations
- Improve input validation using Zod
- Add better error handling for all CRUD operations

package.json

@@ -12,13 +12,14 @@
     "test": "bun test"
   },
   "dependencies": {
-    "hono": "^4.0.0",
     "bcrypt": "^5.1.0",
-    "uuid": "^9.0.0"
+    "hono": "^4.0.0",
+    "uuid": "^9.0.0",
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@types/bcrypt": "^6.0.0",
-    "@types/bun": "latest",
+    "@types/bun": "^1.3.11",
     "typescript": "^5.3.0"
   }
 }