refactor: Relocate ML models to backend package, update path loaders, simplify Dockerfile

backend/app/config.py

@@ -59,8 +59,8 @@ class Settings(BaseSettings):
     clerk_jwks_url: str = ""
     clerk_api_url: str = "https://api.clerk.com"
     clerk_webhook_secret: str = ""
-    clerk_paid_plan_ids: str = ""
-    clerk_paid_plan_slugs: str = "paid,pro"
+    clerk_paid_plan_ids: str = "cplan_3E9Yp1Qf0qVbvx4x15QndPQyLfA"
+    clerk_paid_plan_slugs: str = "paid,pro,pro_plan"
     clerk_enterprise_plan_ids: str = ""
     clerk_enterprise_plan_slugs: str = "enterprise"