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.Application/DTOs/Company/CompanySettingsDtos.cs

@@ -35,6 +35,26 @@ namespace PowderCoating.Application.DTOs.Company
         public decimal OnlinePaymentSurchargeValue { get; set; }
         public bool OnlineSurchargeAcknowledged { get; set; }
         public bool AllowOnlinePayments { get; set; }
+
+        // SMS gating
+        public bool AllowSms { get; set; }
+        public bool SmsEnabled { get; set; }
+        public bool SmsDisabledByAdmin { get; set; }
+        /// <summary>True when the company has an accepted agreement for the current SmsTermsVersion.</summary>
+        public bool HasCurrentSmsAgreement { get; set; }
+        public string SmsTermsVersion { get; set; } = string.Empty;
+    }
+
+    /// <summary>
+    /// DTO for the company admin SMS opt-in/out toggle.
+    /// When enabling for the first time (or after a terms version change), AgreedToTerms must
+    /// be true and TermsVersion must match <c>AppConstants.SmsTermsVersion</c>.
+    /// </summary>
+    public class UpdateSmsPreferencesDto
+    {
+        public bool SmsEnabled { get; set; }
+        public bool AgreedToTerms { get; set; }
+        public string? TermsVersion { get; set; }
     }
 
     /// <summary>