Move X-BanGUI-Request header name/value to backend/app/utils/constants.py as single source of truth. Add GET /api/v1/config/security-headers endpoint. Update csrf middleware, frontend api client, and docs to use shared constants.
- Add _acquire_readonly_connection() that applies PRAGMA query_only=ON after connect
- Verify PRAGMA value back to catch URI flag bypasses
- Wrap in async context manager _readonly_connection() used by all repo methods
- Replace hardcoded '_SESSION_COOKIE_NAME' in CSRF middleware with import from
app.utils.constants
- Remove completed Issues #45 and #46 from Docs/Tasks.md (Issue #46 now fixed,
#45 cache invalidation deferred to auth refactor branch)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>