chore(deps): dependency upgrades — react-router 7, eslint 10, TS 6, plugin-react 6; drop unused zod (v0.16.5-beta)

Applies the open dependabot PRs in one validated pass:

- react-router-dom 6.30 -> 7.18 (drop-in for our API surface; verified
  in-browser: login, sidebar routing, ?type= deep-links, legacy redirects)
- react + react-dom -> 19.2.7, axios -> 1.18.0, lucide-react -> 1.21.0
- actions/checkout v6 -> v7 across all workflows
- backend: eslint 10 + @eslint/js 10 (fix 5 new no-useless-assignment
  findings), typescript 6.0.3 (explicit types: ["node","jest"] in
  tsconfig — TS 6 no longer auto-includes @types), remove zod (unused)
- frontend: @vitejs/plugin-react 6

Not taken: ioredis 5.11.1 (#55) — bullmq pins ioredis to exactly 5.10.1
(including latest bullmq 5.79), so the bump nests a second ioredis and
breaks BullMQ connection types.

Validation: backend tsc/lint/build + 92 tests green; frontend tsc/lint/
build + 11 tests green; docker stack rebuilt and browser-verified.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mikrotik-manager-frontend",
-  "version": "0.16.4-beta",
+  "version": "0.16.5-beta",
   "private": true,
   "type": "module",
   "scripts": {
@@ -16,14 +16,14 @@
     "@xterm/addon-fit": "^0.11.0",
     "@xterm/xterm": "^6.0.0",
     "@xyflow/react": "^12.10.2",
-    "axios": "^1.16.1",
+    "axios": "^1.18.0",
     "clsx": "^2.1.0",
     "date-fns": "^3.2.0",
     "leaflet": "^1.9.4",
-    "lucide-react": "^1.17.0",
-    "react": "^19.2.6",
-    "react-dom": "^19.2.5",
-    "react-router-dom": "^6.21.1",
+    "lucide-react": "^1.21.0",
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7",
+    "react-router-dom": "^7.18.0",
     "recharts": "^2.10.3",
     "socket.io-client": "^4.7.3",
     "tailwind-merge": "^3.5.0",
@@ -33,7 +33,7 @@
     "@eslint/js": "^9.39.4",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^5.2.0",
+    "@vitejs/plugin-react": "^6.0.2",
     "autoprefixer": "^10.4.17",
     "eslint": "^9.39.4",
     "eslint-plugin-react": "^7.37.5",