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>

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mikrotik-manager-backend",
-  "version": "0.16.4-beta",
+  "version": "0.16.5-beta",
   "description": "Mikrotik Network Management Platform - Backend API",
   "main": "dist/index.js",
   "scripts": {
@@ -31,11 +31,10 @@
     "pg": "^8.21.0",
     "qrcode": "^1.5.4",
     "socket.io": "^4.6.1",
-    "ssh2": "^1.14.0",
-    "zod": "^3.22.4"
+    "ssh2": "^1.14.0"
   },
   "devDependencies": {
-    "@eslint/js": "^9.39.4",
+    "@eslint/js": "^10.0.1",
     "@types/bcryptjs": "^2.4.6",
     "@types/compression": "^1.7.5",
     "@types/cors": "^2.8.17",
@@ -49,14 +48,14 @@
     "@types/qrcode": "^1.5.6",
     "@types/ssh2": "^1.11.17",
     "@types/supertest": "^7.2.0",
-    "eslint": "^9.39.4",
+    "eslint": "^10.5.0",
     "eslint-plugin-security": "^4.0.0",
     "jest": "^30.4.2",
     "nodemon": "^3.0.2",
     "supertest": "^7.2.2",
     "ts-jest": "^29.4.9",
     "ts-node": "^10.9.2",
-    "typescript": "^5.3.3",
+    "typescript": "^6.0.3",
     "typescript-eslint": "^8.58.2"
   }
 }