Add API docs

backend/api/package.json

@@ -55,6 +55,8 @@
     "react-dom": "18.2.0",
     "resend": "4.1.2",
     "string-similarity": "4.0.4",
+    "swagger-jsdoc": "6.2.8",
+    "swagger-ui-express": "5.0.1",
     "tsconfig-paths": "4.2.0",
     "twitter-api-v2": "1.15.0",
     "ws": "8.17.0",
@@ -64,6 +66,7 @@
     "@types/cors": "2.8.17",
     "@types/react": "18.3.5",
     "@types/react-dom": "18.3.0",
+    "@types/swagger-ui-express": "4.1.8",
     "@types/ws": "8.5.10"
   }
 }