Add Umami custom event tracking across all key pages

- Created /js/pw-analytics.js with conversion funnel events
- Added to Base.astro layout (all Astro pages) + 6 static HTML pages
- Events tracked: compliance-check-start, compliance-check-complete,
  order-cta-click, checkout-page-view, checkout-start, esign-opened,
  esign-submitted, campaign-click (UTM attribution), contact-form-submit
- Server-side payment-complete event from checkout webhook via Umami API
- Auto-tracks any element with data-track="event-name" attribute

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/src/routes/checkout.ts

@@ -1240,6 +1240,32 @@ export async function handlePaymentComplete(
     }
   }
 
+  // ── Umami analytics — server-side payment event ─────────────────────────
+  try {
+    const umamiUrl = process.env.UMAMI_URL || "http://umami:3000";
+    const websiteId = "55250014-ee15-44ac-a1f6-81dabad3fe0f";
+    await fetch(`${umamiUrl}/api/send`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json", "User-Agent": "PW-API/1.0" },
+      body: JSON.stringify({
+        payload: {
+          website: websiteId,
+          hostname: "performancewest.net",
+          url: `/checkout/complete/${order_type}`,
+          name: "payment-complete",
+          data: {
+            order_type,
+            order_id,
+            payment_method: paymentMethod,
+            total_cents: Number(order.service_fee_cents || order.total_cents || 0),
+            service: (order.service_slug as string) || order_type,
+          },
+        },
+        type: "event",
+      }),
+    });
+  } catch { /* non-fatal */ }
+
   // ── Advance ERPNext Sales Order workflow (CRTC) ────────────────────────
   if (order_type === "canada_crtc") {
     const soName = (order.erpnext_sales_order as string) || null;