feat: Stage 1 — backend and frontend scaffolding

Backend (tasks 1.1, 1.5–1.8):
- pyproject.toml with FastAPI, Pydantic v2, aiosqlite, APScheduler 3.x,
  structlog, bcrypt; ruff + mypy strict configured
- Pydantic Settings (BANGUI_ prefix env vars, fail-fast validation)
- SQLite schema: settings, sessions, blocklist_sources, import_log;
  WAL mode + foreign keys; idempotent init_db()
- FastAPI app factory with lifespan (DB, aiohttp session, scheduler),
  CORS, unhandled-exception handler, GET /api/health
- Fail2BanClient: async Unix-socket wrapper using run_in_executor,
  custom error types, async context manager
- Utility modules: ip_utils, time_utils, constants
- 47 tests; ruff 0 errors; mypy --strict 0 errors

Frontend (tasks 1.2–1.4):
- Vite + React 18 + TypeScript strict; Fluent UI v9; ESLint + Prettier
- Custom brand theme (#0F6CBD, WCAG AA contrast) with light/dark variants
- Typed fetch API client (ApiError, get/post/put/del) + endpoints constants
- tsc --noEmit 0 errors

frontend/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "bangui-frontend",
+  "private": true,
+  "version": "0.1.0",
+  "description": "BanGUI frontend — fail2ban web management interface",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview",
+    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "typecheck": "tsc --noEmit",
+    "format": "prettier --write 'src/**/*.{ts,tsx,css}'"
+  },
+  "dependencies": {
+    "@fluentui/react-components": "^9.55.0",
+    "@fluentui/react-icons": "^2.0.257",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-router-dom": "^6.27.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.13.0",
+    "@types/node": "^25.3.2",
+    "@types/react": "^18.3.12",
+    "@types/react-dom": "^18.3.1",
+    "@typescript-eslint/eslint-plugin": "^8.13.0",
+    "@typescript-eslint/parser": "^8.13.0",
+    "@vitejs/plugin-react": "^4.3.3",
+    "eslint": "^9.13.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-react-hooks": "^5.0.0",
+    "prettier": "^3.3.3",
+    "typescript": "^5.6.3",
+    "vite": "^5.4.11"
+  }
+}