feat: add dashboard with ECharts and SN/callback statistics

Added sn-stats and callback-stats endpoints. HomeView now shows stat cards, pending todos, recent activity, and ECharts pie charts for SN status distribution and callback status. Installed echarts dependency.

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

web/delivery-platform-ui/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "axios": "^1.7.9",
+        "echarts": "^6.1.0",
         "element-plus": "^2.9.1",
         "pinia": "^2.3.0",
         "vue": "^3.5.13",
@@ -1184,6 +1185,16 @@
         "node": ">= 0.4"
       }
     },
+    "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/element-plus": {
       "version": "2.13.6",
       "resolved": "https://registry.npmjs.org/element-plus/-/element-plus-2.13.6.tgz",
@@ -1722,6 +1733,12 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "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/vite": {
       "version": "6.4.1",
       "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",
@@ -1864,6 +1881,15 @@
       "peerDependencies": {
         "vue": "^3.5.0"
       }
+    },
+    "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"
+      }
     }
   }
 }