feat: Add free/exempt subscription status for organizations

- Add 'free' subscription status (exempt from fees)
- POST /admin/organizations/:id/set-free - Set org as free
- POST /admin/organizations/:id/remove-free - Remove free status
- Free orgs get enterprise plan, no expiry

src/middleware/subscription.ts

@@ -38,6 +38,11 @@ export async function subscriptionMiddleware(ctx: Context, next: Next): Promise<
   let message = "";
 
   switch (org.subscription_status) {
+    case "free":
+      // Exempt from fees - always active
+      isActive = true;
+      break;
+
     case "active":
       // Check if subscription has ended
       if (org.subscription_ends_at && new Date(org.subscription_ends_at) < now) {