fix: optimize database initialization and marketplace router ordering

Database Initialization Optimization:
✅ SELECTIVE MODEL IMPORT: Changed from wildcard to explicit imports
- storage/db.py: Import only essential models (Job, Miner, MarketplaceOffer, etc.)
- Reason: Avoids 2+ minute startup delays from loading all domain models
- Impact: Faster application startup while maintaining required functionality

Marketplace Router Ordering Fix:
✅ ROUTER PRECEDENCE: Moved marketplace_offers router after global_marketplace
- main

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

@@ -288,7 +288,6 @@ def create_app() -> FastAPI:
     app.include_router(services, prefix="/v1")
     app.include_router(users, prefix="/v1")
     app.include_router(exchange, prefix="/v1")
-    app.include_router(marketplace_offers, prefix="/v1")
     app.include_router(payments, prefix="/v1")
     app.include_router(web_vitals, prefix="/v1")
     app.include_router(edge_gpu)
@@ -309,6 +308,9 @@ def create_app() -> FastAPI:
     app.include_router(developer_platform, prefix="/v1")
     app.include_router(governance_enhanced, prefix="/v1")
     
+    # Include marketplace_offers AFTER global_marketplace to override the /offers endpoint
+    app.include_router(marketplace_offers, prefix="/v1")
+    
     # Add blockchain router for CLI compatibility
     print(f"Adding blockchain router: {blockchain}")
     app.include_router(blockchain, prefix="/v1")