PDF uploads were stored in S3 and had text extracted during upload, but
fetch_upload_images() filtered exclusively for image MIME types, so
document content never reached the AI.
- Add fetch_upload_documents() in storage_service.py to retrieve
extracted_content for PDFs and text files
- Update ai_sessions.py chat endpoint to call both fetch_upload_images
and fetch_upload_documents, injecting document text as context
- Add PDF text extraction in _generate_ai_description (pypdf)
- Add pypdf>=4.0.0 to requirements.txt
- Fix test_db teardown to avoid connection pool issues
- Add 5 tests for fetch_upload_documents
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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