➕ chore: add express-validator dependency

Add express-validator for API request validation and data sanitization
in agent management endpoints.

package.json

@@ -77,6 +77,7 @@
     "@napi-rs/system-ocr": "patch:@napi-rs/system-ocr@npm%3A1.0.2#~/.yarn/patches/@napi-rs-system-ocr-npm-1.0.2-59e7a78e8b.patch",
     "@strongtz/win32-arm64-msvc": "^0.4.7",
     "express": "^5.1.0",
+    "express-validator": "^7.2.1",
     "faiss-node": "^0.5.1",
     "graceful-fs": "^4.2.11",
     "jsdom": "26.1.0",

yarn.lock

@@ -13180,6 +13180,7 @@ __metadata:
     eslint-plugin-simple-import-sort: "npm:^12.1.1"
     eslint-plugin-unused-imports: "npm:^4.1.4"
     express: "npm:^5.1.0"
+    express-validator: "npm:^7.2.1"
     faiss-node: "npm:^0.5.1"
     fast-diff: "npm:^1.3.0"
     fast-xml-parser: "npm:^5.2.0"
@@ -17530,6 +17531,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"express-validator@npm:^7.2.1":
+  version: 7.2.1
+  resolution: "express-validator@npm:7.2.1"
+  dependencies:
+    lodash: "npm:^4.17.21"
+    validator: "npm:~13.12.0"
+  checksum: 10c0/f859b29ecfb0b5bcdd608e2593bbb928a144d5cf0ead7832c8c496c87edf880b79b812a204544c96ad88e25d4beea6f5fd78cfba138e5d80e7c4cd97a87ea15e
+  languageName: node
+  linkType: hard
+
 "express@npm:^5.0.1, express@npm:^5.1.0":
   version: 5.1.0
   resolution: "express@npm:5.1.0"
@@ -28176,6 +28187,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"validator@npm:~13.12.0":
+  version: 13.12.0
+  resolution: "validator@npm:13.12.0"
+  checksum: 10c0/21d48a7947c9e8498790550f56cd7971e0e3d724c73388226b109c1bac2728f4f88caddfc2f7ed4b076f9b0d004316263ac786a17e9c4edf075741200718cd32
+  languageName: node
+  linkType: hard
+
 "vary@npm:^1, vary@npm:^1.1.2":
   version: 1.1.2
   resolution: "vary@npm:1.1.2"