Remove edge_gpu router from coordinator-api

- Removed edge_gpu import from main.py
- Removed app.include_router(edge_gpu) from main.py
- Deleted edge_gpu.py router file

GPU endpoints now handled by gpu-service on port 8101

This is Phase 4.3d: Update coordinator-api to remove GPU code

apps/coordinator-api/src/app/main.py

@@ -51,7 +51,6 @@ from .routers import (
     client,
     cross_chain_integration,
     developer_platform,
-    edge_gpu,
     exchange,
     explorer,
     global_marketplace,
@@ -331,7 +330,6 @@ def create_app() -> FastAPI:
     app.include_router(exchange, prefix="/v1")
     app.include_router(payments, prefix="/v1")
     app.include_router(web_vitals, prefix="/v1")
-    app.include_router(edge_gpu)
 
     # Add standalone routers for tasks and payments