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/adapters/__init__.py

@@ -0,0 +1,39 @@
+"""
+Auto-register all built-in adapters.
+Also scans importlib entry_points for third-party adapters.
+"""
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def load_builtin_adapters():
+    """Import built-in adapter packages — they self-register on import."""
+    from adapters.arma3 import ARMA3_ADAPTER  # noqa: F401
+
+
+def load_third_party_adapters():
+    """
+    Scan 'languard.adapters' entry_point group for third-party adapters.
+    Third-party packages add this to their pyproject.toml:
+        [project.entry-points."languard.adapters"]
+        mygame = "mygame_adapter:MYGAME_ADAPTER"
+    """
+    try:
+        from importlib.metadata import entry_points
+        eps = entry_points(group="languard.adapters")
+        for ep in eps:
+            try:
+                adapter = ep.load()
+                from adapters.registry import GameAdapterRegistry
+                GameAdapterRegistry.register(adapter)
+                logger.info("Loaded third-party adapter via entry_point: %s", ep.name)
+            except Exception as e:
+                logger.error("Failed to load third-party adapter '%s': %s", ep.name, e)
+    except Exception as e:
+        logger.warning("Entry point scanning failed: %s", e)
+
+
+def initialize_adapters():
+    load_builtin_adapters()
+    load_third_party_adapters()