Technical Debt: Remove deprecated GroundingDINO code

[filthyrake]

Description

The old inference_engine.py (GroundingDINO) exists alongside inference_engine_yolox.py. Docs say YOLOX is 47x faster but old code remains, confusing contributors.

Impact

• Low severity
• Code confusion
• Maintenance burden

Recommendation

Archive it - Keep for historical reference but clear it's not active.

Implementation

1. Create archive/grounding_dino/ directory
2. Move old files there
3. Add README explaining deprecation
4. Update all imports
5. Update documentation

Also Clean Up

• Config text_prompts (lines 137-231) for GroundingDINO
• Old model references
• Unused imports

Location

src/inference_engine.py
config/config.yaml:137-231