fix(prospecting): add missing /prospecting prefix and fix broken template macros

The API router was missing prefix="/prospecting", causing all endpoints to
register at /api/v1/admin/stats instead of /api/v1/admin/prospecting/stats.

Also fix 500 errors on prospects, leads, and scan-jobs pages caused by
importing non-existent macro names (table_empty → table_empty_state,
pagination_controls → pagination).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/prospecting/routes/api/admin.py

@@ -20,7 +20,7 @@ from .admin_leads import router as admin_leads_router
 from .admin_prospects import router as admin_prospects_router
 from .admin_stats import router as admin_stats_router
 
-router = APIRouter()
+router = APIRouter(prefix="/prospecting")
 
 router.include_router(admin_prospects_router, tags=["prospecting-prospects"])
 router.include_router(admin_enrichment_router, tags=["prospecting-enrichment"])