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.Core/Entities/Company.cs

@@ -88,6 +88,19 @@ public class Company : BaseEntity
     /// </summary>
     public bool? AccountingOverride { get; set; }
 
+    /// <summary>
+    /// Company admin opt-in for SMS notifications. Defaults to false — company admin must
+    /// explicitly accept the SMS terms of service before enabling. Has no effect if the plan
+    /// does not allow SMS or if SmsDisabledByAdmin is true.
+    /// </summary>
+    public bool SmsEnabled { get; set; } = false;
+
+    /// <summary>
+    /// SuperAdmin force-disable for this company's SMS. When true, no SMS is sent regardless
+    /// of plan or company settings. Use when a company is abusing SMS or requests a full opt-out.
+    /// </summary>
+    public bool SmsDisabledByAdmin { get; set; } = false;
+
     // Email marketing opt-out (CAN-SPAM compliance for platform broadcast emails)
     public bool MarketingEmailOptOut { get; set; } = false;
     public string MarketingUnsubscribeToken { get; set; } = Guid.NewGuid().ToString("N");