perf: Exclude vector-sync status polling from distributed tracing

Skip tracing for /app/vector-sync/status to reduce noise from HTMX polling.
Metrics collection continues for this endpoint.

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Co-Authored-By: Claude <noreply@anthropic.com>

nextcloud_mcp_server/search/keyword.py

@@ -83,7 +83,7 @@ class KeywordSearchAlgorithm(SearchAlgorithm):
         # Scroll through Qdrant to get all matching documents
         # We need title and excerpt from payload for token matching
         qdrant_client = await get_qdrant_client()
-        collection = settings.qdrant_collection
+        collection = settings.get_collection_name()
 
         all_points = []
         offset = None