fix: handle relative paths in HNSW embedding server metadata

- Convert relative paths to absolute paths based on metadata file location
- Fixes FileNotFoundError when starting embedding server
- Resolves issue with passages file not found in different working directories

packages/leann-backend-hnsw/leann_backend_hnsw/hnsw_embedding_server.py

@@ -81,7 +81,21 @@ def create_hnsw_embedding_server(
     with open(passages_file, "r") as f:
         meta = json.load(f)
 
-    passages = PassageManager(meta["passage_sources"])
+    # Convert relative paths to absolute paths based on metadata file location
+    metadata_dir = Path(
+        passages_file
+    ).parent.parent  # Go up one level from the metadata file
+    passage_sources = []
+    for source in meta["passage_sources"]:
+        source_copy = source.copy()
+        # Convert relative paths to absolute paths
+        if not Path(source_copy["path"]).is_absolute():
+            source_copy["path"] = str(metadata_dir / source_copy["path"])
+        if not Path(source_copy["index_path"]).is_absolute():
+            source_copy["index_path"] = str(metadata_dir / source_copy["index_path"])
+        passage_sources.append(source_copy)
+
+    passages = PassageManager(passage_sources)
     logger.info(
         f"Loaded PassageManager with {len(passages.global_offset_map)} passages from metadata"
     )
@@ -270,15 +284,15 @@ def create_hnsw_embedding_server(
 if __name__ == "__main__":
     import signal
     import sys
-    
+
     def signal_handler(sig, frame):
         logger.info(f"Received signal {sig}, shutting down gracefully...")
         sys.exit(0)
-    
+
     # Register signal handlers for graceful shutdown
     signal.signal(signal.SIGTERM, signal_handler)
     signal.signal(signal.SIGINT, signal_handler)
-    
+
     parser = argparse.ArgumentParser(description="HNSW Embedding service")
     parser.add_argument("--zmq-port", type=int, default=5555, help="ZMQ port to run on")
     parser.add_argument(