feat: implement phases 3-5 of Arma 3 UX enhancement plan

Phase 3 - Mod display names + split-pane selector:
- Parse mod.cpp/meta.cpp for display_name and workshop_id
- Rewrite ModList as two-pane available/selected interface

Phase 4 - Player kick/ban from Players tab:
- Add get_by_slot() to PlayerRepository
- Add get_rcon_client() class method to ThreadRegistry
- Add /players/{slot_id}/kick and /ban endpoints
- Rewrite PlayerTable with kick/ban modals and ban presets

Phase 5 - Historical log file browser:
- Add list_log_files() and get_log_file_path() to RPTParser
- Add logfiles_router with GET/download/DELETE endpoints
- Update LogViewer with collapsible log files section (download + delete)

backend/core/servers/service.py

@@ -396,6 +396,56 @@ class ServerService:
                     data[field] = "***"
         return sections
 
+    def kick_player(self, server_id: int, slot_id: int, reason: str) -> None:
+        from core.threads.thread_registry import ThreadRegistry
+        ra = ThreadRegistry.get_rcon_client(server_id)
+        if not ra or not ra.is_connected():
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail={"code": "RCON_NOT_CONNECTED", "message": "RCon not connected — server must be running"},
+            )
+        success = ra.kick_player(int(slot_id), reason)
+        if not success:
+            raise HTTPException(
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+                detail={"code": "KICK_FAILED", "message": "Kick command failed"},
+            )
+
+    def ban_from_player(
+        self,
+        server_id: int,
+        slot_id: int,
+        reason: str,
+        duration_minutes: int | None,
+        banned_by: str,
+    ) -> dict:
+        from datetime import datetime, timezone, timedelta
+        from core.dal.player_repository import PlayerRepository
+        from core.dal.ban_repository import BanRepository
+        player = PlayerRepository(self._db).get_by_slot(server_id, slot_id)
+        if not player:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail={"code": "NOT_FOUND", "message": "Player not found"},
+            )
+        expires_at = None
+        if duration_minutes is not None and duration_minutes > 0:
+            expires_at = (datetime.now(timezone.utc) + timedelta(minutes=duration_minutes)).isoformat()
+        from core.threads.thread_registry import ThreadRegistry
+        ra = ThreadRegistry.get_rcon_client(server_id)
+        if ra and ra.is_connected():
+            ra.ban_player(player["guid"], duration_minutes or 0, reason)
+        ban_repo = BanRepository(self._db)
+        ban_id = ban_repo.create(
+            server_id=server_id,
+            guid=player["guid"],
+            name=player["name"],
+            reason=reason,
+            banned_by=banned_by,
+            expires_at=expires_at,
+        )
+        return dict(ban_repo.get_by_id(ban_id))
+
     def get_config_schema(self, server_id: int) -> dict:
         server = self.get_server(server_id)
         adapter = GameAdapterRegistry.get(server["game_type"])