nextcloud-mcp-server: add missing icalendar-searcher dependency

Reviewed-on: #3

packages/nextcloud-mcp-server/package.nix

@@ -152,7 +152,7 @@ python3Packages.buildPythonApplication rec {
     googleapis-common-protos opentelemetry-api opentelemetry-proto
     opentelemetry-semantic-conventions opentelemetry-sdk
     x-wr-timezone opentelemetry-util-http opentelemetry-exporter-otlp-proto-common
-    opentelemetry-instrumentation recurring-ical-events
+    opentelemetry-instrumentation recurring-ical-events icalendar-searcher
     opentelemetry-exporter-otlp-proto-grpc qdrant-client
     opentelemetry-instrumentation-asgi opentelemetry-instrumentation-httpx
     opentelemetry-instrumentation-logging langchain-text-splitters mistralai caldav
@@ -178,6 +178,12 @@ python3Packages.buildPythonApplication rec {
       --replace-quiet '">=2.4.5"' '""'
   '';
 
+  # PYTHONPATH from the host environment (e.g., mautrix bridge injecting
+  # Python 3.12 site-packages) causes C extension ABI mismatches on NixOS.
+  # The wrapper's own sys.path has the correct closure packages, so we
+  # unset the external PYTHONPATH to prevent contamination.
+  makeWrapperArgs = [ "--unset" "PYTHONPATH" ];
+
   dontCheckRuntimeDeps = true;
   catchConflicts = false;