Add SMS gating, TCPA terms agreement, and compose-before-send modal

- Three-tier SMS gate: platform kill-switch → admin force-disable → plan AllowSms → company opt-in
- CompanySmsAgreement entity records admin acceptance of TCPA terms with IP, user agent, and terms version
- SMS terms of service modal on Company Settings with versioned re-agreement (AppConstants.SmsTermsVersion)
- Dev redirect: non-production SMS routed to Twilio:DevRedirectPhone to protect real customer numbers
- Removed redundant Ready for Pickup SMS (Job Completed covers it)
- Role-based compose modal on job completion: Admin/Manager reviews and edits before send; ShopFloor auto-sends
- Send SMS button on job details for ad-hoc messages (Admin/Manager only)
- SendJobSmsAsync auto-appends STOP opt-out language if missing
- Migrations: AddSmsGating, AddCompanySmsAgreement

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

src/PowderCoating.Web/Controllers/PlatformSubscriptionController.cs

@@ -64,6 +64,7 @@ public class PlatformSubscriptionController : Controller
             AllowAiPhotoQuotes = c.AllowAiPhotoQuotes,
             AllowAiInventoryAssist = c.AllowAiInventoryAssist,
             AllowAiCatalogPriceCheck = c.AllowAiCatalogPriceCheck,
+            AllowSms = c.AllowSms,
             IsActive = c.IsActive,
             SortOrder = c.SortOrder
         }).ToList();
@@ -104,6 +105,7 @@ public class PlatformSubscriptionController : Controller
             AllowAiPhotoQuotes = config.AllowAiPhotoQuotes,
             AllowAiInventoryAssist = config.AllowAiInventoryAssist,
             AllowAiCatalogPriceCheck = config.AllowAiCatalogPriceCheck,
+            AllowSms = config.AllowSms,
             IsActive = config.IsActive
         };
 
@@ -149,6 +151,7 @@ public class PlatformSubscriptionController : Controller
         config.AllowAiPhotoQuotes = dto.AllowAiPhotoQuotes;
         config.AllowAiInventoryAssist = dto.AllowAiInventoryAssist;
         config.AllowAiCatalogPriceCheck = dto.AllowAiCatalogPriceCheck;
+        config.AllowSms = dto.AllowSms;
         config.IsActive = dto.IsActive;
 
         await _unitOfWork.SubscriptionPlanConfigs.UpdateAsync(config);