Normalize README metadata and formatting

Normalize model-card metadata and README formatting across Comfy-Org: use a consistent key and tag order, add upstream/base-model metadata where applicable, normalize code fences, remove redundant separators, and ensure a final newline.

README.md

@@ -60,4 +60,4 @@ Place the files in the following folders:
 
 - I2V：https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_i2v.json
 - T2V：https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_t2v.json
-- R2V：https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_r2v.json
+- R2V：https://github.com/Comfy-Org/workflow_templates/blob/main/templates/video_minimax_h3_r2v.json