Add invoice SMS notifications and customer intake kiosk

Invoice SMS:
- Send Invoice modal now prompts Email/SMS/Both based on customer contact data
- New /invoice/{token} customer-facing view page with full line items and pay button
- PublicViewToken (permanent) added to Invoice; separate from expiring PaymentLinkToken
- InvoiceSent SMS default template added; customizable via Notification Templates settings
- {{viewUrl}} placeholder documented in template editor

Customer Intake Kiosk:
- Tablet kiosk flow: Contact → Job → Terms/Signature → Confirmation
- Remote link mode for off-site customers (lighter form, no signature)
- KioskHub (AllowAnonymous SignalR) for staff-to-tablet push without login
- Staff activates tablet via cookie; sends remote link manually
- Submitted sessions create Customer + Job automatically; fires in-app notification

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

src/PowderCoating.Web/Views/Kiosk/Intake/Job.cshtml

@@ -0,0 +1,46 @@
+@model PowderCoating.Application.DTOs.Kiosk.SubmitKioskJobDto
+@{
+    Layout = "~/Views/Shared/_KioskLayout.cshtml";
+    ViewData["Title"] = "About Your Project";
+    var token = ViewBag.SessionToken as Guid? ?? Guid.Empty;
+}
+
+<div class="kiosk-card">
+    <h2 class="fw-bold mb-1" style="font-size:1.6rem;">What brings you in?</h2>
+    <p class="text-muted mb-4">Tell us a little about what you need coated.</p>
+
+    <form method="post" action="/Kiosk/Intake/@token/Job">
+        @Html.AntiForgeryToken()
+
+        <div class="mb-3">
+            <label asp-for="JobDescription" class="form-label">Describe your project</label>
+            <textarea asp-for="JobDescription" class="form-control" rows="5"
+                      placeholder="e.g. Motorcycle frame, two-tone black and chrome, remove old coating first..."
+                      style="min-height:160px;resize:none;"></textarea>
+            <span asp-validation-for="JobDescription" class="text-danger small"></span>
+        </div>
+
+        <div class="mb-4">
+            <label asp-for="HowDidYouHearAboutUs" class="form-label">How did you hear about us? <span class="text-muted fw-normal">(optional)</span></label>
+            <select asp-for="HowDidYouHearAboutUs" class="form-select">
+                <option value="">— Select one —</option>
+                <option>Google / Online Search</option>
+                <option>Friend or Family Referral</option>
+                <option>Social Media</option>
+                <option>Drove by the shop</option>
+                <option>Returning Customer</option>
+                <option>Other</option>
+            </select>
+        </div>
+
+        <div class="d-flex gap-3">
+            <a href="/Kiosk/Intake/@token/Contact" class="btn btn-outline-secondary"
+               style="min-height:64px;border-radius:12px;font-size:1.1rem;flex:0 0 auto;padding:0 2rem;">
+                <i class="bi bi-arrow-left me-1"></i> Back
+            </a>
+            <button type="submit" class="btn btn-primary kiosk-btn">
+                Continue <i class="bi bi-arrow-right ms-2"></i>
+            </button>
+        </div>
+    </form>
+</div>