feat(subscriptions): migrate subscription management to merchant level and seed tiers

Move subscription create/edit from store detail (broken endpoint) to merchant
detail page with proper modal UI. Seed 4 subscription tiers (Essential,
Professional, Business, Enterprise) in init_production.py. Also includes
cross-module dependency declarations, store domain platform_id migration,
platform context middleware, CMS route fixes, and migration backups.

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

scripts/init_production.py

@@ -40,6 +40,7 @@ from app.modules.tenancy.services.permission_discovery_service import (
 from middleware.auth import AuthManager
 from app.modules.tenancy.models import AdminSetting, Platform
 from app.modules.tenancy.models import User
+from app.modules.billing.models.subscription import SubscriptionTier
 
 # Register all models with SQLAlchemy so string-based relationships resolve
 for _mod in [
@@ -380,6 +381,72 @@ def create_admin_settings(db: Session) -> int:
     return settings_created
 
 
+def create_subscription_tiers(db: Session, platform: Platform) -> int:
+    """Create default subscription tiers for the OMS platform."""
+
+    tier_defs = [
+        {
+            "code": "essential",
+            "name": "Essential",
+            "price_monthly_cents": 2900,
+            "price_annual_cents": 29000,
+            "is_public": True,
+            "display_order": 10,
+        },
+        {
+            "code": "professional",
+            "name": "Professional",
+            "price_monthly_cents": 7900,
+            "price_annual_cents": 79000,
+            "is_public": True,
+            "display_order": 20,
+        },
+        {
+            "code": "business",
+            "name": "Business",
+            "price_monthly_cents": 14900,
+            "price_annual_cents": 149000,
+            "is_public": True,
+            "display_order": 30,
+        },
+        {
+            "code": "enterprise",
+            "name": "Enterprise",
+            "price_monthly_cents": 29900,
+            "price_annual_cents": None,
+            "is_public": False,
+            "display_order": 40,
+        },
+    ]
+
+    tiers_created = 0
+    for tdef in tier_defs:
+        existing = db.execute(
+            select(SubscriptionTier).where(SubscriptionTier.code == tdef["code"])
+        ).scalar_one_or_none()
+
+        if existing:
+            print_warning(f"Tier already exists: {existing.name} ({existing.code})")
+            continue
+
+        tier = SubscriptionTier(
+            platform_id=platform.id,
+            code=tdef["code"],
+            name=tdef["name"],
+            price_monthly_cents=tdef["price_monthly_cents"],
+            price_annual_cents=tdef["price_annual_cents"],
+            is_public=tdef["is_public"],
+            display_order=tdef["display_order"],
+            is_active=True,
+        )
+        db.add(tier)
+        db.flush()
+        tiers_created += 1
+        print_success(f"Created tier: {tier.name} ({tier.code})")
+
+    return tiers_created
+
+
 def verify_rbac_schema(db: Session) -> bool:
     """Verify that RBAC schema is in place."""
 
@@ -456,6 +523,14 @@ def initialize_production(db: Session, auth_manager: AuthManager):
     print_step(5, "Creating admin settings...")
     create_admin_settings(db)
 
+    # Step 6: Seed subscription tiers
+    print_step(6, "Seeding subscription tiers...")
+    oms_platform = next((p for p in platforms if p.code == "oms"), None)
+    if oms_platform:
+        create_subscription_tiers(db, oms_platform)
+    else:
+        print_warning("OMS platform not found, skipping tier seeding")
+
     # Commit all changes
     db.commit()
     print_success("All changes committed")
@@ -470,11 +545,13 @@ def print_summary(db: Session):
     user_count = db.query(User).filter(User.role == "admin").count()
     setting_count = db.query(AdminSetting).count()
     platform_count = db.query(Platform).count()
+    tier_count = db.query(SubscriptionTier).filter(SubscriptionTier.is_active.is_(True)).count()
 
     print("\n📊 Database Status:")
     print(f"  Admin users:     {user_count}")
     print(f"  Platforms:       {platform_count}")
     print(f"  Admin settings:  {setting_count}")
+    print(f"  Sub. tiers:      {tier_count}")
 
     print("\n" + "─" * 70)
     print("🔐 ADMIN CREDENTIALS")