chore(backend): mypy strict clean + ruff format pass

Pre-merge sanity per devops checklist (ruff format --check, mypy --strict).

Type fixes:
- ORM models: `Mapped[dict]` → `Mapped[dict[str, Any]]` (audit, scenario, run,
  report, ttp, detection.artifact_files_json). Equivalent on Pydantic DTOs
  (TtpBase.params_schema_json, ScenarioStepBase.params_override_json).
- Rename `TtpRead.current_version` → `TtpRead.version` to mirror the ORM
  column (which itself was renamed in D-009 cleanup).
- Flask blueprints: add `-> ResponseReturnValue` to every view, plus typed
  UUID params on `_validate_step_consistency`.
- `templating/filters.py`: rewrite the conditional re2 import so mypy can
  narrow the union (`ModuleType | None`); the runtime branch on `_re2 is not
  None` removes the unused-ignore that was triggered by warn_unused_ignores.
- `pyproject.toml`: add `flask_login.*` and `pythonjsonlogger.*` to the
  `[[tool.mypy.overrides]]` `ignore_missing_imports` list (both ship without
  typed marker).
- Misc: drop stale `# type: ignore` comments (`app.py:36`,
  `rbac/decorators.py:35`) flagged by `warn_unused_ignores`. Keep
  `logging.JsonFormatter` ignore because the symbol exists at runtime but is
  not re-exported through the typed surface.

Formatting:
- `ruff format` applied (15 files normalized; line-length unchanged at 100).

Verification on this commit:
- `ruff check`  → All checks passed.
- `ruff format --check` → 68 files already formatted.
- `mypy --strict src` → Success: no issues found in 54 source files.
- `pytest tests/unit` → 49 passed.

backend/src/mimic/logging.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import logging
 import sys
 
-from pythonjsonlogger.jsonlogger import JsonFormatter
+from pythonjsonlogger.jsonlogger import JsonFormatter  # type: ignore[attr-defined]
 
 
 def configure_logging(level: str = "INFO", *, as_json: bool = True) -> None:
@@ -16,9 +16,7 @@ def configure_logging(level: str = "INFO", *, as_json: bool = True) -> None:
             "%(asctime)s %(levelname)s %(name)s %(message)s"
         )
     else:
-        formatter = logging.Formatter(
-            "%(asctime)s %(levelname)-8s %(name)s: %(message)s"
-        )
+        formatter = logging.Formatter("%(asctime)s %(levelname)-8s %(name)s: %(message)s")
     handler.setFormatter(formatter)
 
     root = logging.getLogger()