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/Views/Companies/Edit.cshtml

@@ -149,6 +149,16 @@
                             </div>
                         </div>
 
+                        <h5 class="card-title mb-3 pb-2 border-bottom">SMS Override</h5>
+                        <p class="text-muted small mb-3">Use this to immediately cut off SMS for a company — for example if they are sending abusive messages or have a billing dispute. This overrides the plan entitlement and the company's own opt-in setting.</p>
+                        <div class="mb-4">
+                            <div class="form-check form-switch">
+                                <input asp-for="SmsDisabledByAdmin" class="form-check-input" type="checkbox" role="switch" id="SmsDisabledByAdmin" />
+                                <label asp-for="SmsDisabledByAdmin" class="form-check-label fw-medium text-danger">Force-disable SMS for this company</label>
+                            </div>
+                            <div class="form-text">When checked, no outbound SMS will be sent for this company regardless of their plan or own settings.</div>
+                        </div>
+
                         <div class="d-flex gap-2 justify-content-end">
                             <a asp-action="Index" class="btn btn-secondary">Cancel</a>
                             <button type="submit" class="btn btn-primary">