Fix service init params and simplify VRAM monitor

- Fix GenerationService params: registry, database
- Simplify VRAM display to basic Markdown for now

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

main.py

@@ -59,8 +59,9 @@ async def initialize_services():
     # Initialize services
     logger.info("Initializing services...")
     generation_service = GenerationService(
-        model_registry=model_registry,
+        registry=model_registry,
         gpu_manager=gpu_manager,
+        database=db,
         output_dir=settings.output_dir,
     )