feat: Switch to using async client

pyproject.toml

@@ -17,6 +17,7 @@ dependencies = [
 nc-mcp-server = "nextcloud_mcp_server.server:run"
 
 [tool.pytest.ini_options]
+asyncio_mode = "auto"
 log_cli = 1
 log_cli_level = "WARN"
 log_level = "WARN"
@@ -38,9 +39,10 @@ build-backend = "poetry.core.masonry.api"
 
 [dependency-groups]
 dev = [
-    "black>=25.1.0",
     "commitizen>=4.8.2",
     "ipython>=9.2.0",
     "pytest>=8.3.5",
+    "pytest-asyncio>=1.0.0",
     "pytest-cov>=6.1.1",
+    "ruff>=0.11.13",
 ]