Function GenerateCardTemplate

Auto-generate a CardTemplate from entity metadata.

Priority logic:

1. Title: All fields with IsNameField=true, sorted by Sequence. Falls back to heuristic name detection, then first string field.
2. Display fields: DefaultInView=true fields sorted by Sequence (up to maxFields). Falls back to metric-keyword fields, then first N non-PK/FK fields.
3. Subtitle/Description/Thumbnail/Badge: Detected via keyword matching on field names.