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")

apps/coordinator-api/src/app/services/marketplace.py

@@ -36,11 +36,11 @@ class MarketplaceService:
             stmt = stmt.where(MarketplaceOffer.status == normalised)
 
         stmt = stmt.offset(offset).limit(limit)
-        offers = self.session.execute(stmt).all()
+        offers = self.session.execute(stmt).scalars().all()
         return [self._to_offer_view(o) for o in offers]
 
     def get_stats(self) -> MarketplaceStatsView:
-        offers = self.session.execute(select(MarketplaceOffer)).all()
+        offers = self.session.execute(select(MarketplaceOffer)).scalars().all()
         open_offers = [offer for offer in offers if offer.status == "open"]
 
         total_offers = len(offers)

apps/coordinator-api/src/app/storage/db.py

@@ -62,7 +62,13 @@ def get_engine() -> Engine:
     return _engine
 
 
-from app.domain import *
+# Import only essential models for database initialization
+# This avoids loading all domain models which causes 2+ minute startup delays
+from app.domain import (
+    Job, Miner, MarketplaceOffer, MarketplaceBid, 
+    User, Wallet, Transaction, UserSession,
+    JobPayment, PaymentEscrow, JobReceipt
+)
 
 def init_db() -> Engine:
     """Initialize database tables and ensure data directory exists."""