Add max_automation_runs quota to billing plans

Adds a new integer feature to track monthly automation flow executions.
Quotas are set to 4× the monthly appointment limit per plan:
- Free: 0 (no automations)
- Starter: 2,000 (500 appointments × 4 flows)
- Growth: 8,000 (2,000 appointments × 4 flows)
- Pro: 40,000 (10,000 appointments × 4 flows)
- Enterprise: Unlimited

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

smoothschedule/smoothschedule/billing/management/commands/billing_seed_catalog.py

@@ -50,6 +50,7 @@ FEATURES = [
     {"code": "max_email_per_month", "name": "Monthly Emails", "description": "Maximum emails per month", "feature_type": "integer", "category": "limits", "tenant_field_name": "max_email_per_month", "display_order": 80},
     {"code": "max_storage_mb", "name": "Storage (MB)", "description": "File storage limit in megabytes", "feature_type": "integer", "category": "limits", "tenant_field_name": "max_storage_mb", "display_order": 90},
     {"code": "max_api_calls_per_day", "name": "Daily API Calls", "description": "Maximum API calls per day", "feature_type": "integer", "category": "limits", "tenant_field_name": "max_api_calls_per_day", "display_order": 100},
+    {"code": "max_automation_runs", "name": "Monthly Automation Runs", "description": "Maximum automation flow executions per month", "feature_type": "integer", "category": "limits", "tenant_field_name": "max_automation_runs", "display_order": 110},
 
     # --- Payments & Revenue ---
     {"code": "payment_processing", "name": "Online Payments", "description": "Accept online payments from customers", "feature_type": "boolean", "category": "payments", "tenant_field_name": "can_accept_payments", "display_order": 10},
@@ -134,6 +135,7 @@ PLANS = [
             "max_api_calls_per_day": 0,
             "max_sms_per_month": 0,
             "max_public_pages": 0,
+            "max_automation_runs": 0,  # No automations on free plan
         },
     },
     {
@@ -172,6 +174,7 @@ PLANS = [
             "max_api_calls_per_day": 0,
             "max_sms_per_month": 0,
             "max_public_pages": 1,
+            "max_automation_runs": 2000,  # 500 appointments × 4 flows
         },
     },
     {
@@ -218,6 +221,7 @@ PLANS = [
             "max_storage_mb": 10000,
             "max_api_calls_per_day": 10000,
             "max_public_pages": 5,
+            "max_automation_runs": 8000,  # 2,000 appointments × 4 flows
         },
     },
     {
@@ -273,6 +277,7 @@ PLANS = [
             "max_storage_mb": 50000,
             "max_api_calls_per_day": 50000,
             "max_public_pages": 10,
+            "max_automation_runs": 40000,  # 10,000 appointments × 4 flows
         },
     },
     {
@@ -334,6 +339,7 @@ PLANS = [
             "max_storage_mb": None,
             "max_api_calls_per_day": None,
             "max_public_pages": None,
+            "max_automation_runs": None,  # Unlimited
         },
     },
 ]