fix: Fix issues in unified examples

- Add smart path detection for data directory
- Fix add_texts -> add_text method call
- Handle both running from project root and examples directory

examples/base_rag_example.py

@@ -164,7 +164,8 @@ class BaseRAGExample(ABC):
         batch_size = 1000
         for i in range(0, len(texts), batch_size):
             batch = texts[i : i + batch_size]
-            builder.add_texts(batch)
+            for text in batch:
+                builder.add_text(text)
             print(f"Added {min(i + batch_size, len(texts))}/{len(texts)} texts...")
 
         print("Building index structure...")

examples/document_rag.py

@@ -26,11 +26,17 @@ class DocumentRAG(BaseRAGExample):
     def _add_specific_arguments(self, parser):
         """Add document-specific arguments."""
         doc_group = parser.add_argument_group("Document Parameters")
+
+        # Smart default path detection
+        default_data_dir = Path("examples/data")
+        if not default_data_dir.exists() and Path("data").exists():
+            default_data_dir = Path("data")
+
         doc_group.add_argument(
             "--data-dir",
             type=str,
-            default="examples/data",
-            help="Directory containing documents to index (default: examples/data)",
+            default=str(default_data_dir),
+            help=f"Directory containing documents to index (default: {default_data_dir})",
         )
         doc_group.add_argument(
             "--file-types",