fix: apply isort formatting to fix CI linting

Applied isort to properly sort all imports according to PEP8:
- Standard library imports first
- Third-party imports second
- Local imports last
- Alphabetical ordering within each group

All tests still passing after import reordering.

tools/__init__.py

@@ -2,10 +2,10 @@
 Tool implementations for Gemini MCP Server
 """
 
-from .think_deeper import ThinkDeeperTool
-from .review_code import ReviewCodeTool
-from .debug_issue import DebugIssueTool
 from .analyze import AnalyzeTool
+from .debug_issue import DebugIssueTool
+from .review_code import ReviewCodeTool
+from .think_deeper import ThinkDeeperTool
 
 __all__ = [
     "ThinkDeeperTool",