feat: 新增容量看板（4G/5G 高负荷分析大屏）

- 后端 dashboard 路由：status/overview/cells/cell，基于 4G/5G 结果表聚合分析
- 前端 CapacityDashboard：4G/5G 切换、汇总卡片(数字滚动)、echarts 图表(环形/直方/柱/饼)、问题小区清单、详情抽屉(指标+优化建议+同扇区邻区)
- 侧边菜单「容量看板」置于数据处理下方；无结果表时居中提示「请先进行数据处理」
- 新增依赖 echarts；封装 EChart 组件

frontend/package-lock.json

@@ -10,9 +10,9 @@
       "dependencies": {
         "@tauri-apps/api": "^2.11.0",
         "@vicons/ionicons5": "^0.13.0",
+        "echarts": "^6.1.0",
         "monaco-editor": "^0.55.1",
         "naive-ui": "^2.42.0",
-        "swagger-ui-dist": "^5.32.6",
         "vue": "^3.5.0",
         "vue-router": "^5.0.7"
       },
@@ -1008,13 +1008,6 @@
         "win32"
       ]
     },
-    "node_modules/@scarf/scarf": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/@scarf/scarf/-/scarf-1.4.0.tgz",
-      "integrity": "sha512-xxeapPiUXdZAE3che6f3xogoJPeZgig6omHEy1rIY5WVsB3H2BHNnZH+gHG6x91SCWyQCzWGsuL2Hh3ClO5/qQ==",
-      "hasInstallScript": true,
-      "license": "Apache-2.0"
-    },
     "node_modules/@tauri-apps/api": {
       "version": "2.11.0",
       "resolved": "https://registry.npmjs.org/@tauri-apps/api/-/api-2.11.0.tgz",
@@ -1419,6 +1412,16 @@
         "@types/trusted-types": "^2.0.7"
       }
     },
+    "node_modules/echarts": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/echarts/-/echarts-6.1.0.tgz",
+      "integrity": "sha512-q0yaFPggC9FUdsWH4blavRWFmxdrIodbkoKNAjJudAI6CA9gNPxHtV2RcZNEepZVlk4yvBYkOkbk6HIVpIyHZA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tslib": "2.3.0",
+        "zrender": "6.1.0"
+      }
+    },
     "node_modules/entities": {
       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/entities/-/entities-7.0.1.tgz",
@@ -1937,15 +1940,6 @@
         "url": "https://github.com/sponsors/antfu"
       }
     },
-    "node_modules/swagger-ui-dist": {
-      "version": "5.32.6",
-      "resolved": "https://registry.npmjs.org/swagger-ui-dist/-/swagger-ui-dist-5.32.6.tgz",
-      "integrity": "sha512-75ttZNaYCLoFPnozPZcTUU6mS3wKT8l7WLjU5zJSHFeJa23i5vtnze6IiCl4jDMPeQTXVXIgovq4M11NNfQvSA==",
-      "license": "Apache-2.0",
-      "dependencies": {
-        "@scarf/scarf": "=1.4.0"
-      }
-    },
     "node_modules/tinyglobby": {
       "version": "0.2.16",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.16.tgz",
@@ -1968,6 +1962,12 @@
       "integrity": "sha512-M8RGFoKtZ8dF+iwJfAJTOH/SM4KluKOKRJpjCMhI8bG3qB74zrFoArKZ62ll0Fr3mqkMJiQOmWYkdYgDeITYQg==",
       "license": "MIT"
     },
+    "node_modules/tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg==",
+      "license": "0BSD"
+    },
     "node_modules/typescript": {
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
@@ -2379,6 +2379,15 @@
       "funding": {
         "url": "https://github.com/sponsors/eemeli"
       }
+    },
+    "node_modules/zrender": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/zrender/-/zrender-6.1.0.tgz",
+      "integrity": "sha512-oEGMDB6pOP2S6OwRR4PdVv610zrjnA3Bh+JnSG12fYJlBKjtNAoEb5fSUoCOOINlH96I2fU38/A2UpRKs67xYQ==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tslib": "2.3.0"
+      }
     }
   }
 }