feat: Add TIFF support to document and image generate routes

[devin-ai-integration]

Summary

Adds support for TIFF files (including multi-page TIFFs) to both the image and document generate CLI commands. Multi-page TIFFs are handled similarly to PDFs - each page/frame is extracted and passed as separate images to the API.

Changes:

• New vlmrun/common/tiff.py utility for extracting pages from multi-page TIFF files using PIL
• Added .tif to SUPPORTED_IMAGE_FILETYPES and both .tif/.tiff to SUPPORTED_DOCUMENT_FILETYPES
• Updated CLI generate image command to handle multi-page TIFFs
• Updated CLI generate document command to convert TIFFs to images and route through image.generate() instead of document.generate()
• Version bump to 0.17.18

Review & Testing Checklist for Human

• Verify version 0.17.18 is correct - This is a significant jump from 0.5.4. Confirm this is the intended version number.
• Test with actual multi-page TIFF files - The implementation was not tested with real TIFF files. Verify that:
  • Single-page TIFFs work correctly in both image and document commands
  • Multi-page TIFFs correctly extract all frames
  • The extracted images are properly converted to RGB and passed to the API
• Verify TIFF document routing behavior - TIFFs in the document command are routed through client.image.generate() rather than client.document.generate(). Confirm this is the expected behavior.

Suggested test plan:

# Test single-page TIFF with image command
vlmrun generate image /path/to/single-page.tif --domain document.invoice

# Test multi-page TIFF with image command  
vlmrun generate image /path/to/multi-page.tif --domain document.invoice

# Test multi-page TIFF with document command
vlmrun generate document /path/to/multi-page.tiff --domain document.invoice

Notes

• The chat.py changes are just formatting fixes from black, not functional changes
• Link to Devin run: https://app.devin.ai/sessions/60a626cbc8954a7a8c6e36157f6bf855
• Requested by: dinesh@vlm.run

[devin-ai-integration]

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