feat: add admin traffic usage page with TanStack Table

Add AdminTrafficUsage page showing per-user traffic statistics by node
with period filtering (1/3/7/14/30d), server-side sorting, search,
pagination, and CSV export. Uses @tanstack/react-table with manual
sorting and dynamic node columns.

package-lock.json

@@ -24,6 +24,7 @@
         "@radix-ui/react-tooltip": "^1.2.8",
         "@radix-ui/react-visually-hidden": "^1.2.4",
         "@tanstack/react-query": "^5.8.0",
+        "@tanstack/react-table": "^8.21.3",
         "@telegram-apps/sdk-react": "^3.3.9",
         "autoprefixer": "^10.4.24",
         "axios": "^1.6.0",
@@ -2626,6 +2627,39 @@
         "react": "^18 || ^19"
       }
     },
+    "node_modules/@tanstack/react-table": {
+      "version": "8.21.3",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-table/-/react-table-8.21.3.tgz",
+      "integrity": "sha512-5nNMTSETP4ykGegmVkhjcS8tTLW6Vl4axfEGQN3v0zdHYbK4UfoqfPChclTrJ4EoK9QynqAu9oUf8VEmrpZ5Ww==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/table-core": "8.21.3"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": ">=16.8",
+        "react-dom": ">=16.8"
+      }
+    },
+    "node_modules/@tanstack/table-core": {
+      "version": "8.21.3",
+      "resolved": "https://registry.npmjs.org/@tanstack/table-core/-/table-core-8.21.3.tgz",
+      "integrity": "sha512-ldZXEhOBb8Is7xLs01fR3YEc3DERiz5silj8tnGkFZytt1abEvl/GhUmCE0PMLaMPTa3Jk4HbKmRlHmu+gCftg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
     "node_modules/@telegram-apps/bridge": {
       "version": "2.11.0",
       "resolved": "https://registry.npmjs.org/@telegram-apps/bridge/-/bridge-2.11.0.tgz",