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/CLAUDE.md

@@ -0,0 +1,73 @@
+# Languard Server Manager
+
+## Quick Start
+
+```bash
+# Backend (from backend/)
+python -m uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+
+# Frontend (from frontend/)
+npx vite --host
+```
+
+- Backend API: http://localhost:8000 (docs: http://localhost:8000/docs)
+- Frontend: http://localhost:5173
+- Default admin: `admin` / (random, printed at first startup; reset via `python -c "from core.auth.utils import hash_password; print(hash_password('admin123'))"` then update SQLite)
+
+## Architecture
+
+FastAPI + SQLite backend, React 19 + TypeScript + Vite frontend. See ARCHITECTURE.md for full details.
+
+### Key Rules
+- Frontend types must match API response shapes, NOT database schema columns
+- There is no REST endpoint for logs — logs are only pushed via WebSocket events
+- WebSocket `onEvent` callback is the mechanism for receiving real-time log entries
+- Config updates use optimistic locking (config_version) — 409 on conflict
+- Sensitive config fields are encrypted at rest with Fernet
+
+## Current Implementation Status
+
+### Backend: Fully implemented (42+ endpoints)
+All routers, services, repositories, game adapter system, WebSocket, background threads, and scheduled cleanup are complete.
+
+### Frontend: Mostly implemented
+
+| Route | Status | Notes |
+|-------|--------|-------|
+| `/login` | Complete | Zod + react-hook-form validation |
+| `/` | Complete | Dashboard with server grid |
+| `/servers/:id` | Complete | 7-tab detail page (overview, config, players, bans, missions, mods, logs) |
+| `/servers/new` | Partial | 4-step wizard; **known bug: form validation issues cause silent failure on submit** |
+| `/settings` | Complete | Password change + admin user management |
+
+### Known Bugs (as of 2026-04-17)
+
+1. **Create Server silent failure**: The 4-step wizard's "Next" buttons don't validate before advancing steps, so users can reach step 3 with invalid data. `handleSubmit` then silently fails because validation errors prevent `onSubmit` from firing. Fix: validate on each "Next" click using `trigger()` from react-hook-form.
+
+### Frontend Type Mapping (API → Frontend)
+
+| API Resource | Frontend Type | Key Fields |
+|---|---|---|
+| Server (enriched) | `Server` in useServers.ts | `game_port`, `current_players`, `max_players`, `cpu_percent`, `ram_mb` |
+| Mission | `Mission` in useServerDetail.ts | `name`, `filename`, `size_bytes` |
+| Mod | `Mod` in useServerDetail.ts | `name`, `path`, `size_bytes`, `enabled` |
+| Ban | `Ban` in useServerDetail.ts | `id`, `server_id`, `guid`, `name`, `reason`, `banned_by`, `banned_at`, `expires_at`, `is_active`, `game_data` |
+| Player | `Player` in useServerDetail.ts | `id`, `slot_id`, `name`, `guid`, `ip`, `ping` |
+
+## Test Commands
+
+```bash
+# Frontend unit tests
+cd frontend && npx vitest run
+
+# Frontend type check
+cd frontend && npx tsc --noEmit
+
+# Backend (no test suite yet)
+```
+
+## Future Enhancements (user requested)
+
+- Config sub-tab redesign for user-friendliness (non-technical users)
+- "Choose mission" button that auto-selects mission for server config
+- Mission rotation management