add pg vector and embed

package.json

@@ -20,12 +20,20 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
+    "@langchain/community": "^0.3.53",
+    "@langchain/openai": "^0.6.9",
     "@nestjs/common": "^11.0.1",
     "@nestjs/core": "^11.0.1",
     "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/swagger": "^11.2.0",
     "@prisma/client": "^6.14.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.2",
+    "langchain": "^0.3.31",
+    "pg": "^8.11.3",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1",
+    "swagger-ui-express": "^5.0.1",
     "xlsx": "^0.18.5"
   },
   "devDependencies": {