fix: Corregir todos los warnings de linting (ruff, black)

- Corregir import ordering (TC002) moviendo User a TYPE_CHECKING
- Corregir type hints implícitos (RUF013) usando | None
- Corregir boolean traps (FBT001/FBT002) usando keyword-only args
- Corregir logging warnings (G201) usando logger.exception()
- Formatear código con ruff format y black

Co-authored-by: dawnsystem <42047891+dawnsystem@users.noreply.github.com>

src/documents/ai_deletion_manager.py

@@ -14,9 +14,11 @@ According to agents.md requirements:
 from __future__ import annotations
 
 import logging
+from typing import TYPE_CHECKING
 from typing import Any
 
-from django.contrib.auth.models import User
+if TYPE_CHECKING:
+    from django.contrib.auth.models import User
 
 logger = logging.getLogger("paperless.ai_deletion")