feat: Phase 1 — Config UI Schema system with per-field widget routing

- Backend: add Arma3ConfigGenerator.get_ui_schema() with widget hints per field
- Backend: add ServerService.get_config_schema() and GET /config/schema endpoint
- Frontend: add FieldSchema/ConfigSchema types + useServerConfigSchema hook
- Frontend: new TagListEditor component for dynamic string-list editing
- Frontend: ConfigEditor now routes each field to correct widget (text/number/password/textarea/select/toggle/tag-list)
- Frontend: password fields have show/hide toggle; toggles render as checkbox; tag-list uses TagListEditor
- Tests: 8 new tests covering hook and TagListEditor; all 136 tests green

backend/core/servers/router.py

@@ -134,6 +134,15 @@ def get_config(
     return _ok(ServerService(db).get_config(server_id))
 
 
+@router.get("/{server_id}/config/schema")
+def get_config_schema(
+    server_id: int,
+    db: Annotated[Connection, Depends(get_db)] = None,
+    _user: Annotated[dict, Depends(get_current_user)] = None,
+):
+    return _ok(ServerService(db).get_config_schema(server_id))
+
+
 @router.get("/{server_id}/config/preview")
 def get_config_preview(
     server_id: int,