style: Fix 411 ruff lint issues (Kimi's issue #4)

Auto-fixed lint issues with ruff --fix and --unsafe-fixes:

Issue #4: Ruff Lint Issues
- Before: 447 errors (originally reported as ~5,500)
- After: 55 errors remaining
- Fixed: 411 errors (92% reduction)

Auto-fixes applied:
- 156 UP006: List/Dict → list/dict (PEP 585)
- 63 UP045: Optional[X] → X | None (PEP 604)
- 52 F401: Removed unused imports
- 52 UP035: Fixed deprecated imports
- 34 E712: True/False comparisons → not/bool()
- 17 F841: Removed unused variables
- Plus 37 other auto-fixable issues

Remaining 55 errors (non-critical):
- 39 B904: Exception chaining (best practice)
- 5 F401: Unused imports (edge cases)
- 3 SIM105: Could use contextlib.suppress
- 8 other minor style issues

These remaining issues are code quality improvements, not critical bugs.

Result: Code quality significantly improved (92% of linting issues resolved)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/test_adaptors/test_adaptors_e2e.py

@@ -850,7 +850,6 @@ export default {
             # Should have categories from reference files
             # Files: getting_started.md, reactivity_api.md, components_guide.md
             # Categories derived from filenames (stem.replace("_", " ").lower())
-            expected_refs = {"getting started", "reactivity api", "components guide"}
 
             # Check that at least one reference category exists
             ref_categories = categories - {"overview"}

tests/test_adaptors/test_chroma_adaptor.py

@@ -4,8 +4,6 @@ Tests for Chroma Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest
 

tests/test_adaptors/test_faiss_adaptor.py

@@ -4,8 +4,6 @@ Tests for FAISS Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest
 

tests/test_adaptors/test_haystack_adaptor.py

@@ -4,8 +4,6 @@ Tests for Haystack Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest
 

tests/test_adaptors/test_langchain_adaptor.py

@@ -4,8 +4,6 @@ Tests for LangChain Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest
 

tests/test_adaptors/test_llama_index_adaptor.py

@@ -4,8 +4,6 @@ Tests for LlamaIndex Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest
 

tests/test_adaptors/test_qdrant_adaptor.py

@@ -4,8 +4,6 @@ Tests for Qdrant Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest
 

tests/test_adaptors/test_weaviate_adaptor.py

@@ -4,8 +4,6 @@ Tests for Weaviate Adaptor
 """
 
 import json
-import tempfile
-from pathlib import Path
 
 import pytest