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/adapters/arma3/mod_manager.py

@@ -15,6 +15,24 @@ logger = logging.getLogger(__name__)
 _MOD_DIR_PATTERN = re.compile(r"^@.+", re.IGNORECASE)
 
 
+def _parse_mod_cpp(mod_dir: Path) -> str | None:
+    mod_cpp = mod_dir / "mod.cpp"
+    if not mod_cpp.exists():
+        return None
+    text = mod_cpp.read_text(errors="ignore")
+    m = re.search(r'name\s*=\s*"([^"]+)"', text, re.IGNORECASE)
+    return m.group(1) if m else None
+
+
+def _parse_meta_cpp(mod_dir: Path) -> str | None:
+    meta_cpp = mod_dir / "meta.cpp"
+    if not meta_cpp.exists():
+        return None
+    text = meta_cpp.read_text(errors="ignore")
+    m = re.search(r'publishedid\s*=\s*(\d+)', text, re.IGNORECASE)
+    return m.group(1) if m else None
+
+
 class Arma3ModData(BaseModel):
     """Mod data schema for Arma 3."""
     workshop_id: str = ""
@@ -60,6 +78,8 @@ class Arma3ModManager:
                         "name": entry.name,
                         "path": str(entry.resolve()),
                         "size_bytes": size,
+                        "display_name": _parse_mod_cpp(entry),
+                        "workshop_id": _parse_meta_cpp(entry),
                     })
         except OSError as exc:
             raise AdapterError(f"Cannot scan mod directory: {exc}") from exc