metadata: add 59-class baseline taxonomy crosswalk mapped to Tongren-95

metadata: add unified multi-cohort clinical abbreviations crosswalk (135+ terms)

metadata: add 66-class fine-grained ophthalmic taxonomy codebook and disambiguation guide

docs: update README with comprehensive clinical abbreviations and diagnostic codebook

Add Section 7 to root README linking to data_processing toolkit

Add standalone data_processing directory with per-script dataset mapping and detailed purpose comments

Add data processing, de-identification & quality control toolkit

Add de-identified diagnostic reports for Chengdu UBM, Chengdu FFA, Yinhai FFA, and Data0410

Add yinhai_ffa de-identified clinical provisional reports

Add RFMiD1 reconstruction instructions

Add AIChallenger reconstruction instructions

Add OCTA-500 reconstruction instructions

Add UBM SW3200L reconstruction instructions

Add Handan FFA clinical data index (JSON)

Add Tongren reconstruction instructions

Add Tongren 95-class bilingual taxonomy crosswalk (CSV)

Add REFUGE test split index (JSON)

Add REFUGE val split index (JSON)

Add REFUGE train split index (JSON)

Add ORIGA glaucoma diagnoses and CDR (CSV)

Add ORIGA image list (CSV)

Add G1020 glaucoma labels and CDR (CSV)

Add Kaggle glaucoma dataset metadata (JSON)

Add DeepDRiD official README card

Add DeepDRiD test manifest (CSV)

Add DeepDRiD val manifest (CSV)

Add DeepDRiD train manifest (CSV)

Add DeepDRiD split summary (JSON)

Add DeepDRiD frozen external cohort (CSV)

Add DeepDRiD admission summary (JSON)

Add DeepDRiD admission manifest (CSV)

Add Yinhai B-scan cleaned v3 annotations (JSON)

Add Yinhai B-scan ultrasound clinical diagnoses (JSON)

Add Xiangya B-scan cleaned v3 annotations (JSON)

Add Xiangya B-scan ultrasound clinical diagnoses (JSON)

Add YinhaiUBM cleaned v3 clinical annotations (JSON)

Add YinhaiUBM clinical diagnostic annotations (JSON)

Add 83w fundus cleaning report audit metadata (JSON)

Add 83w fundus cleaning report audit metadata (CSV)

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