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Replace fragile header/column-index approach with pattern-based ASIN detection:
- Scan all cells for Amazon ASIN pattern (B[0-9A-Z]{9}) to auto-detect the ASIN column regardless of headers or position
- Detect country from sheet name with flexible matching (no hardcoded sheet name list)
- Detect reason column from header keywords, no hardcoded column indices
- Remove all hardcoded fallback indices (col 13, 18, 9, etc.) that caused empty results
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>