README: add manga-ocr-ja pack + attribution

manga-ocr-ja pack: fp16 MNN conversion of jzhang533/manga-ocr-base-2025 (Apache-2.0)

Add PP-OCRv6 unified recognizer: keys.txt

Add PP-OCRv6 unified recognizer: rec.mnn

README: add arabic/cyrillic/devanagari/thai (staged ahead of wiring)

Add paddle-rec-thai (PP-OCRv5 mobile recognizer, MNN) — ahead of language wiring

Add paddle-rec-devanagari (PP-OCRv5 mobile recognizer, MNN) — ahead of language wiring

Add paddle-rec-cyrillic (PP-OCRv5 mobile recognizer, MNN) — ahead of language wiring

Add paddle-rec-arabic (PP-OCRv5 mobile recognizer, MNN) — ahead of language wiring

README: add latin + korean recognizers

Add paddle-rec-korean (PP-OCRv5 mobile recognizer, MNN)

Add paddle-rec-latin (PP-OCRv5 mobile recognizer, MNN)

Add README with per-pack license/attribution

Add PaddleOCR PP-OCRv5 mobile CJK+EN recognizer pack (rec + keys, MNN)

Add Meiki Japanese OCR pack (det + horizontal/vertical recognizers, MNN)

initial commit