refactor: simplify architecture and harden lifecycle

Remove obsolete implementations, centralize background task ownership and terminal-state recovery, consolidate frontend routing and log streaming, and enforce project-wide verification in CI.

web/package.json

@@ -8,6 +8,9 @@
   },
   "scripts": {
     "dev": "vite",
+    "lint": "eslint . --max-warnings 0",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
     "typecheck": "tsc --noEmit -p tsconfig.json && tsc --noEmit -p tsconfig.node.json",
     "build": "npm run typecheck && vite build",
     "preview": "vite preview",
@@ -22,10 +25,11 @@
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-i18next": "^16.5.6",
-    "react-router-dom": "^7.0.0",
+    "react-router-dom": "^7.18.2",
     "zustand": "^5.0.15"
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.2.0",
     "@testing-library/user-event": "^14.6.4",
@@ -33,8 +37,14 @@
     "@types/react": "^18.3.20",
     "@types/react-dom": "^18.3.6",
     "@vitejs/plugin-react": "^4.3.4",
+    "eslint": "^10.9.1",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-react-hooks": "^7.1.1",
+    "eslint-plugin-react-refresh": "^0.5.4",
     "jsdom": "^26.0.0",
+    "prettier": "^3.9.6",
     "typescript": "^5.7.3",
+    "typescript-eslint": "^8.68.0",
     "vite": "^6.4.3",
     "vitest": "^4.1.10"
   }