feat: add chatbot module and service

package-lock.json

@@ -19,6 +19,7 @@
         "@nestjs/swagger": "^11.2.6",
         "@nestjs/throttler": "^6.5.0",
         "@nestjs/typeorm": "^11.0.0",
+        "@openrouter/sdk": "^1.3.33",
         "bcrypt": "^6.0.0",
         "class-transformer": "^0.5.1",
         "class-validator": "^0.14.3",
@@ -3086,6 +3087,15 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/@openrouter/sdk": {
+      "version": "1.3.33",
+      "resolved": "https://registry.npmjs.org/@openrouter/sdk/-/sdk-1.3.33.tgz",
+      "integrity": "sha512-MrrmDSxbHxX5XrhWlT+cfN1yMf8xu078LiQKtelazpQdHwrHSbyPBd+2y7rx77P3Uix+7uj8MTOX5lPrpx7nwQ==",
+      "hasInstallScript": true,
+      "dependencies": {
+        "zod": "^3.25.0 || ^4.0.0"
+      }
+    },
     "node_modules/@paralleldrive/cuid2": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/@paralleldrive/cuid2/-/cuid2-2.3.1.tgz",
@@ -12063,6 +12073,14 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "node_modules/zod": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.6.5.tgz",
+      "integrity": "sha512-v5l/aFXZQeai4awLbOpSoHecE9UiMrnfx75tEXLjNonXVARxQ5mOeipTjROUchszUNCqnE+hqAMujRsRHsut2Q==",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }