style: apply black and isort formatting

Run formatting tools on Phase 1 changes:
- black (code formatter)
- isort (import sorter)
- ruff (linter)

All linting checks pass.

backend/main.py

@@ -14,8 +14,8 @@ from innercontext.api import (  # noqa: E402
     ai_logs,
     health,
     inventory,
-    profile,
     products,
+    profile,
     routines,
     skincare,
 )