chore: move zod to peerDependencies

Author: yingzhi0808

package.json

@@ -93,8 +93,7 @@
     "swagger-ui-dist": "^5.25.3",
     "ts-morph": "^26.0.0",
     "typescript": "^5.8.3",
-    "yaml": "^2.8.0",
-    "zod": "^3.25.67"
+    "yaml": "^2.8.0"
   },
   "devDependencies": {
     "@biomejs/biome": "^2.0.6",
@@ -123,6 +122,7 @@
     "@types/koa__router": "^12.0.0",
     "express": "^5.0.0",
     "hono": "^4.0.0",
-    "koa": "^3.0.0"
+    "koa": "^3.0.0",
+    "zod": "^3.25.0"
   }
 }