优化平台公告的md显示

frontend/package-lock.json

@@ -11,6 +11,7 @@
         "@element-plus/icons-vue": "^2.3.1",
         "axios": "^1.13.2",
         "element-plus": "^2.11.9",
+        "marked": "^18.0.5",
         "pinia": "^3.0.4",
         "qrcode": "^1.5.4",
         "vue": "^3.5.24",
@@ -2245,6 +2246,18 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/marked": {
+      "version": "18.0.5",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-18.0.5.tgz",
+      "integrity": "sha512-S6GcvALHg6K4ohtu4E7x0a1AqhAjp6cV8KhLSyN9qVapnzJkusVBxZRcIU9AeYsbe6P1hKDusSbEOzGyyuce6w==",
+      "license": "MIT",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 20"
+      }
+    },
     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",