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/arma3/adapter.py

@@ -0,0 +1,59 @@
+"""Arma 3 adapter — composes all Arma 3 capability implementations."""
+from adapters.arma3.config_generator import Arma3ConfigGenerator
+from adapters.arma3.process_config import Arma3ProcessConfig
+
+# Capabilities enabled so far (add more as phases complete)
+_CAPABILITIES = {
+    "config_generator",
+    "process_config",
+    "log_parser",
+    "remote_admin",
+    "ban_manager",
+    "mission_manager",
+    "mod_manager",
+}
+
+
+class Arma3Adapter:
+    game_type = "arma3"
+    display_name = "Arma 3"
+    version = "1.0.0"
+
+    def get_config_generator(self):
+        return Arma3ConfigGenerator()
+
+    def get_process_config(self):
+        return Arma3ProcessConfig()
+
+    def get_log_parser(self):
+        from adapters.arma3.log_parser import RPTParser
+        return RPTParser()
+
+    def get_remote_admin(self):
+        """Return the RemoteAdmin factory for Arma3 BattlEye RCon."""
+        from adapters.arma3.remote_admin import Arma3RemoteAdminFactory
+        return Arma3RemoteAdminFactory()
+
+    def get_mission_manager(self, server_id: int | None = None):
+        from adapters.arma3.mission_manager import Arma3MissionManager
+        return Arma3MissionManager(server_id=server_id)
+
+    def get_mod_manager(self, server_id: int | None = None):
+        from adapters.arma3.mod_manager import Arma3ModManager
+        return Arma3ModManager(server_id=server_id)
+
+    def get_ban_manager(self, server_id: int | None = None):
+        from adapters.arma3.ban_manager import Arma3BanManager
+        return Arma3BanManager(server_id=server_id)
+
+    def has_capability(self, name: str) -> bool:
+        return name in _CAPABILITIES
+
+    def get_additional_routers(self) -> list:
+        return []
+
+    def get_custom_thread_factories(self) -> list:
+        return []
+
+
+ARMA3_ADAPTER = Arma3Adapter()