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/service.py

@@ -396,6 +396,14 @@ class ServerService:
                     data[field] = "***"
         return sections
 
+    def get_config_schema(self, server_id: int) -> dict:
+        server = self.get_server(server_id)
+        adapter = GameAdapterRegistry.get(server["game_type"])
+        config_gen = adapter.get_config_generator()
+        if hasattr(config_gen, "get_ui_schema"):
+            return config_gen.get_ui_schema()
+        return {}
+
     def get_config_section(self, server_id: int, section: str) -> dict:
         server = self.get_server(server_id)
         adapter = GameAdapterRegistry.get(server["game_type"])