docs(pdftract-5nare): add comprehensive FAQ with 24 questions
Added docs/user-docs/src/faq.md with 24 FAQ entries covering:
- General questions (what is pdftract, extract vs extract_text, JS execution)
- Installation and setup (proxy, system requirements)
- Usage (broken_vector, OCR speed, page ranges, images, batch processing)
- Configuration (custom profiles, OCR accuracy, confidence scores)
- Output formats (Markdown, tables, metadata, passwords)
- Troubleshooting (errors, empty output, debugging, memory usage)
Each answer is 1-3 paragraphs with cross-links to fuller docs.
mdBook builds successfully.
Acceptance criteria:
- PASS: docs/user-docs/src/faq.md exists
- PASS: 24 questions covered (target: 15-25)
- PASS: Each answer is 1-3 paragraphs
- PASS: Cross-links work
- PASS: mdBook renders cleanly
Closes: pdftract-5nare
2ccdaecda1