fix: reorder subscription routes to prevent /stats matching /{vendor_id}

FastAPI was matching /stats as a vendor_id (expecting int), causing 422 error.
Move /stats and /billing/history endpoints BEFORE /{vendor_id} so they take precedence.

Route order now:
1. /tiers/* - tier management
2. / - list subscriptions
3. /stats - statistics (before /{vendor_id})
4. /billing/history - billing history (before /{vendor_id})
5. /{vendor_id} - vendor detail endpoints (catch-all for ints)

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

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

app/api/v1/admin/subscriptions.py

@@ -159,54 +159,19 @@ def list_vendor_subscriptions(
     )
 
 
-@router.get("/{vendor_id}", response_model=VendorSubscriptionWithVendor)
-def get_vendor_subscription(
-    vendor_id: int = Path(..., description="Vendor ID"),
+# ============================================================================
+# Statistics Endpoints
+# ============================================================================
+
+
+@router.get("/stats", response_model=SubscriptionStatsResponse)
+def get_subscription_stats(
     current_user: User = Depends(get_current_admin_api),
     db: Session = Depends(get_db),
 ):
-    """Get subscription details for a specific vendor."""
-    sub, vendor = admin_subscription_service.get_subscription(db, vendor_id)
-
-    return VendorSubscriptionWithVendor(
-        **VendorSubscriptionResponse.model_validate(sub).model_dump(),
-        vendor_name=vendor.name,
-        vendor_code=vendor.subdomain,
-        orders_limit=sub.orders_limit,
-        products_limit=sub.products_limit,
-        team_members_limit=sub.team_members_limit,
-    )
-
-
-@router.patch("/{vendor_id}", response_model=VendorSubscriptionWithVendor)
-def update_vendor_subscription(
-    update_data: VendorSubscriptionUpdate,
-    vendor_id: int = Path(..., description="Vendor ID"),
-    current_user: User = Depends(get_current_admin_api),
-    db: Session = Depends(get_db),
-):
-    """
-    Update a vendor's subscription.
-
-    Allows admins to:
-    - Change tier
-    - Update status
-    - Set custom limit overrides
-    - Extend trial period
-    """
-    data = update_data.model_dump(exclude_unset=True)
-    sub, vendor = admin_subscription_service.update_subscription(db, vendor_id, data)
-    db.commit()
-    db.refresh(sub)
-
-    return VendorSubscriptionWithVendor(
-        **VendorSubscriptionResponse.model_validate(sub).model_dump(),
-        vendor_name=vendor.name,
-        vendor_code=vendor.subdomain,
-        orders_limit=sub.orders_limit,
-        products_limit=sub.products_limit,
-        team_members_limit=sub.team_members_limit,
-    )
+    """Get subscription statistics for admin dashboard."""
+    stats = admin_subscription_service.get_stats(db)
+    return SubscriptionStatsResponse(**stats)
 
 
 # ============================================================================
@@ -262,15 +227,55 @@ def list_billing_history(
 
 
 # ============================================================================
-# Statistics Endpoints
+# Vendor Subscription Detail Endpoints
 # ============================================================================
 
 
-@router.get("/stats", response_model=SubscriptionStatsResponse)
-def get_subscription_stats(
+@router.get("/{vendor_id}", response_model=VendorSubscriptionWithVendor)
+def get_vendor_subscription(
+    vendor_id: int = Path(..., description="Vendor ID"),
     current_user: User = Depends(get_current_admin_api),
     db: Session = Depends(get_db),
 ):
-    """Get subscription statistics for admin dashboard."""
-    stats = admin_subscription_service.get_stats(db)
-    return SubscriptionStatsResponse(**stats)
+    """Get subscription details for a specific vendor."""
+    sub, vendor = admin_subscription_service.get_subscription(db, vendor_id)
+
+    return VendorSubscriptionWithVendor(
+        **VendorSubscriptionResponse.model_validate(sub).model_dump(),
+        vendor_name=vendor.name,
+        vendor_code=vendor.subdomain,
+        orders_limit=sub.orders_limit,
+        products_limit=sub.products_limit,
+        team_members_limit=sub.team_members_limit,
+    )
+
+
+@router.patch("/{vendor_id}", response_model=VendorSubscriptionWithVendor)
+def update_vendor_subscription(
+    update_data: VendorSubscriptionUpdate,
+    vendor_id: int = Path(..., description="Vendor ID"),
+    current_user: User = Depends(get_current_admin_api),
+    db: Session = Depends(get_db),
+):
+    """
+    Update a vendor's subscription.
+
+    Allows admins to:
+    - Change tier
+    - Update status
+    - Set custom limit overrides
+    - Extend trial period
+    """
+    data = update_data.model_dump(exclude_unset=True)
+    sub, vendor = admin_subscription_service.update_subscription(db, vendor_id, data)
+    db.commit()
+    db.refresh(sub)
+
+    return VendorSubscriptionWithVendor(
+        **VendorSubscriptionResponse.model_validate(sub).model_dump(),
+        vendor_name=vendor.name,
+        vendor_code=vendor.subdomain,
+        orders_limit=sub.orders_limit,
+        products_limit=sub.products_limit,
+        team_members_limit=sub.team_members_limit,
+    )