feat: implement full backend + frontend server detail, settings, and create server pages

Backend:
- Complete FastAPI backend with 42+ REST endpoints (auth, servers, config,
  players, bans, missions, mods, games, system)
- Game adapter architecture with Arma 3 as first-class adapter
- WebSocket real-time events for status, metrics, logs, players
- Background thread system (process monitor, metrics, log tail, RCon poller)
- Fernet encryption for sensitive config fields at rest
- JWT auth with admin/viewer roles, bcrypt password hashing
- SQLite with WAL mode, parameterized queries, migration system
- APScheduler cleanup jobs for logs, metrics, events

Frontend:
- Server Detail page with 7 tabs (overview, config, players, bans,
  missions, mods, logs)
- Settings page with password change and admin user management
- Create Server wizard (4-step; known bug: silent validation failure)
- New hooks: useServerDetail, useAuth, useGames
- New components: ServerHeader, ConfigEditor, PlayerTable, BanTable,
  MissionList, ModList, LogViewer, PasswordChange, UserManager
- WebSocket onEvent callback for real-time log accumulation
- 120 unit tests passing (Vitest + React Testing Library)

Docs:
- Added .gitignore, CLAUDE.md, README.md
- Updated FRONTEND.md, ARCHITECTURE.md with current implementation state
- Added .env.example for backend configuration

Known issues:
- Create Server form: "Next" buttons don't validate before advancing,
  causing silent submit failure when fields are invalid
- Config sub-tabs need UX redesign for non-technical users

backend/requirements.txt

@@ -0,0 +1,50 @@
+annotated-doc==0.0.4
+annotated-types==0.7.0
+anyio==4.13.0
+APScheduler==3.11.2
+bcrypt==5.0.0
+certifi==2026.2.25
+cffi==2.0.0
+click==8.3.2
+colorama==0.4.6
+cryptography==46.0.7
+Deprecated==1.3.1
+ecdsa==0.19.2
+fastapi==0.135.3
+greenlet==3.4.0
+h11==0.16.0
+httpcore==1.0.9
+httptools==0.7.1
+httpx==0.28.1
+idna==3.11
+iniconfig==2.3.0
+limits==5.8.0
+packaging==26.1
+passlib==1.7.4
+pluggy==1.6.0
+psutil==7.2.2
+pyasn1==0.6.3
+pycparser==3.0
+pydantic==2.13.1
+pydantic-settings==2.13.1
+pydantic_core==2.46.1
+Pygments==2.20.0
+pytest==9.0.3
+pytest-asyncio==1.3.0
+python-dotenv==1.2.2
+python-jose==3.5.0
+python-multipart==0.0.26
+PyYAML==6.0.3
+rsa==4.9.1
+six==1.17.0
+slowapi==0.1.9
+SQLAlchemy==2.0.49
+starlette==1.0.0
+typing-inspection==0.4.2
+typing_extensions==4.15.0
+tzdata==2026.1
+tzlocal==5.3.1
+uvicorn==0.44.0
+watchfiles==1.1.1
+websockets==16.0
+wrapt==2.1.2