Add scheduled automation task and update URL routing

- Introduced a new scheduled task for executing automation rules every 5 minutes in the Celery beat schedule.
- Updated URL routing to include a new endpoint for automation-related functionalities.
- Refactored imports in various modules to align with the new business layer structure, ensuring backward compatibility for billing models, exceptions, and services.

backend/igny8_core/modules/billing/constants.py

@@ -1,21 +1,4 @@
-"""
-Credit Cost Constants
-Phase 0: Credit-only system costs per operation
-"""
-CREDIT_COSTS = {
-    'clustering': 10,                    # Per clustering request
-    'idea_generation': 15,               # Per cluster → ideas request
-    'content_generation': 1,             # Per 100 words
-    'image_prompt_extraction': 2,        # Per content piece
-    'image_generation': 5,               # Per image
-    'linking': 8,                        # Per content piece (NEW)
-    'optimization': 1,                   # Per 200 words (NEW)
-    'site_structure_generation': 50,     # Per site blueprint (NEW)
-    'site_page_generation': 20,          # Per page (NEW)
-    # Legacy operation types (for backward compatibility)
-    'ideas': 15,                         # Alias for idea_generation
-    'content': 3,                        # Legacy: 3 credits per content piece
-    'images': 5,                          # Alias for image_generation
-    'reparse': 1,                        # Per reparse
-}
+# Backward compatibility alias - constants moved to business/billing/
+from igny8_core.business.billing.constants import CREDIT_COSTS
 
+__all__ = ['CREDIT_COSTS']