refactor: remove scripts from minimax-image-generation skill

Inline the API call example directly in SKILL.md instead of
providing a separate generate.sh script.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

minimax-image-generation/CLAUDE.md

@@ -58,7 +58,5 @@ All three are standard Unix tools. No Python or Node required.
 ```
 minimax-image-generation/
 ├── SKILL.md          # Skill definition + user-facing docs
-├── scripts/
-│   └── generate.sh   # Generation script (CLI entry point)
 └── CLAUDE.md         # These implementation notes
 ```