Test Excel endpoint

Code/TODO.md

@@ -49,7 +49,15 @@ Rationale: De-risk unknowns (Docling OCR quality, Ollama CPU inference speed) be
 **Tested Formats:**
 
 - PDF (Filing Receipt) — extracted text, tables, CJK content ✅
-- PNG (Email screenshot) — extracted subject, dates, recipient ✅ (CJK trademark garbled, may need `ocr_lang`)
+- PNG (Email screenshot) — extracted subject, dates, recipient ✅
+- PNG with `ocr_lang=ch_tra` — Traditional Chinese extracted correctly (官藥坊) ✅
+
+**Portable Chinese OCR:**
+
+- Auto-downloads `ch_sim` (Simplified) and `ch_tra` (Traditional) models on first run
+- Models persist in `docling_models` volume
+- First run takes ~1-2 min extra for model download; subsequent runs instant
+- Use `ocr_lang=ch_tra` for HK/Taiwan, `ocr_lang=ch_sim` for Mainland China
 
 ### 1b. Ollama (DONE)