feat: Add LLM-based OCR as alternative to Tesseract (#2442)

* feat(ocr): add LLM-based OCR support alongside Tesseract

Add support for using configured LLM inference providers (OpenAI or Ollama)
for OCR text extraction from images as an alternative to Tesseract.

Changes:
- Add OCR_USE_LLM environment variable flag (default: false)
- Add buildOCRPrompt function for LLM-based text extraction
- Add readImageTextWithLLM function in asset preprocessing worker
- Update extractAndSaveImageText to route between Tesseract and LLM OCR
- Update documentation with the new configuration option

When OCR_USE_LLM is enabled, the system uses the configured inference model
to extract text from images. If no inference provider is configured, it
falls back to Tesseract.

https://claude.ai/code/session_01Y7h7kDAmqXKXEWDmWbVkDs

* format

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Co-authored-by: Claude <noreply@anthropic.com>

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