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### What problem does this PR solve? This PR fixes WebDAV sync behavior for unsupported file types ([#13795](https://github.com/infiniflow/ragflow/issues/13795)). Previously, the WebDAV connector selected files primarily by modified time (and size threshold) and could still pass unsupported extensions into the download/document-generation path. This caused unnecessary processing and inconsistent behavior compared with connectors that validate file type earlier. This change adds extension validation in two places: 1. **Early filter during recursive listing** to skip unsupported files before they enter the download flow. 2. **Defensive filter before download/document creation** to prevent unsupported files from being processed if any listing edge case slips through. It also wires `allow_images` into the WebDAV sync path so image extension handling follows connector policy. Scope is intentionally limited to WebDAV for a focused bug-fix PR. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) ### How was this tested? - Manual verification with mixed file types under the configured WebDAV path: - supported: `.pdf`, `.txt`, `.md` - unsupported: `.exe`, `.bin`, `.dat` - Triggered full sync and polling sync. - Confirmed unsupported files are skipped before download. - Confirmed supported files are still indexed normally. - Confirmed image handling follows `allow_images` setting. Fixes: #13795