feat(settings): add all missing config settings to settings page with enhanced UX
Add 64 previously missing settings from config.py to SETTING_METADATA,
making them all configurable via the settings page UI.
New categories: PDF/A Archival, Security
Enhanced UX:
- Slider inputs for threshold values (text_quality_threshold, near_duplicate_threshold)
- Dropdown selects for s3_storage_class, s3_acl, pdfa_format, security_header_x_frame_options_value
- All 8 PDF/A settings now configurable via the UI
- Security headers, audit logging, rate limiting, CORS settings added
- IMAP 1 & 2, S3, Meilisearch, Deduplication, Embedding settings added
- Task retry, step timeout, file size limits settings added
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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