Use the SSRF-safe HTTP client for file_url downloads and add redirect-aware
guards to the docreader Playwright path, closing GHSA-44fp, GHSA-rv6v, and
GHSA-c7m6.
Introduce opendataloader and PaddleOCR-VL parser engines with tenant-level
settings UI, replace liteparse, and harden Excel/PPT/Markdown parsing.
Optional odl-hybrid sidecar stays local-build only and is excluded from
default dev-start and full profiles.