fixed issues

package-lock.json

@@ -9,9 +9,11 @@
       "version": "0.0.1",
       "dependencies": {
         "@types/cors": "^2.8.19",
+        "@types/diff-match-patch": "^1.0.36",
         "@types/express": "^5.0.6",
         "axios": "^1.13.5",
         "cors": "^2.8.6",
+        "diff-match-patch": "^1.0.5",
         "express": "^5.2.1"
       },
       "devDependencies": {
@@ -302,6 +304,12 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/diff-match-patch": {
+      "version": "1.0.36",
+      "resolved": "https://registry.npmjs.org/@types/diff-match-patch/-/diff-match-patch-1.0.36.tgz",
+      "integrity": "sha512-xFdR6tkm0MWvBfO8xXCSsinYxHcqkQUlcHeSpMC2ukzOb6lwQAfDmW+Qt0AvlGd8HpsS28qKsB+oPeJn9I39jg==",
+      "license": "MIT"
+    },
     "node_modules/@types/express": {
       "version": "5.0.6",
       "resolved": "https://registry.npmjs.org/@types/express/-/express-5.0.6.tgz",
@@ -1244,6 +1252,12 @@
         "node": ">=0.3.1"
       }
     },
+    "node_modules/diff-match-patch": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/diff-match-patch/-/diff-match-patch-1.0.5.tgz",
+      "integrity": "sha512-IayShXAgj/QMXgB0IWmKx+rOPuGMhqm5w6jvFxmVenXKIzRqTAAsbBPT3kWQeGANj3jGgvcvv4yK6SxqYmikgw==",
+      "license": "Apache-2.0"
+    },
     "node_modules/dir-glob": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",