feat: 增加手动设置编辑器编码的功能

Related to #5

package-lock.json

@@ -1825,6 +1825,12 @@
         "vscode-uri": "^3.0.8"
       }
     },
+    "node_modules/@vscode/iconv-lite-umd": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@vscode/iconv-lite-umd/-/iconv-lite-umd-0.7.0.tgz",
+      "integrity": "sha512-bRRFxLfg5dtAyl5XyiVWz/ZBPahpOpPrNYnnHpOpUZvam4tKH35wdhP4Kj6PbM0+KdliOsPzbGWpkxcdpNB/sg==",
+      "license": "MIT"
+    },
     "node_modules/@vue/compiler-core": {
       "version": "3.5.13",
       "resolved": "https://registry.npmjs.org/@vue/compiler-core/-/compiler-core-3.5.13.tgz",
@@ -8847,11 +8853,14 @@
         "@fortawesome/fontawesome-free": "^6.7.2",
         "@hcaptcha/vue3-hcaptcha": "^1.3.0",
         "@tailwindcss/vite": "^4.1.4",
+        "@vscode/iconv-lite-umd": "^0.7.0",
         "@xterm/addon-fit": "^0.10.0",
         "@xterm/addon-search": "^0.15.0",
         "axios": "^1.8.4",
+        "buffer": "^6.0.3",
         "date-fns": "^4.1.0",
         "guacamole-common-js": "^1.5.0",
+        "iconv-lite": "^0.6.3",
         "monaco-editor": "^0.52.2",
         "pinia": "^3.0.2",
         "pinia-plugin-persistedstate": "^4.2.0",
@@ -9266,6 +9275,30 @@
         "node": ">=18"
       }
     },
+    "packages/frontend/node_modules/buffer": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
+      "integrity": "sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.2.1"
+      }
+    },
     "packages/frontend/node_modules/esbuild": {
       "version": "0.25.3",
       "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.3.tgz",