feat: add on-booking-created and on-inquiry-created Edge Functions with DB-trigger wiring

Wires pg_net-based database triggers on bookings/inquiries to invoke the two
Edge Functions on insert. Two empirically-discovered fixes over the brief's
literal SQL were required to make this work locally:

- ALTER DATABASE ... SET for a custom GUC needs superuser, but the local
  migration role (postgres) isn't superuser in this Supabase CLI stack (only
  supabase_admin is) - inlined the base URL as a literal constant in each
  trigger function instead.
- pg_net's http_post lives in schema `net`, not `extensions.net` - fixed the
  function calls accordingly.

Also disabled verify_jwt for both functions in config.toml since they're
invoked by pg_net (no Authorization header), not by end-user clients.

Claude-Session: https://claude.ai/code/session_01NhxA4npAXAxmCDEJt6kxSH

supabase/functions/on-inquiry-created/index.ts

@@ -0,0 +1,38 @@
+import { createClient } from 'jsr:@supabase/supabase-js@2'
+import { buildInquiryNotificationEmail } from '../_shared/email.ts'
+
+const FROM_ADDRESS = 'bookings@braidsbymira.com'
+const MIRA_EMAIL = 'hello@braidsbymira.com'
+
+Deno.serve(async (req) => {
+  const payload = await req.json()
+  const inquiry = payload.record
+
+  const supabaseAdmin = createClient(
+    Deno.env.get('SUPABASE_URL')!,
+    Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!,
+  )
+
+  const { data: product } = await supabaseAdmin
+    .from('products')
+    .select('name')
+    .eq('id', inquiry.product_id)
+    .single()
+
+  const { subject, html } = buildInquiryNotificationEmail({
+    productName: product?.name ?? inquiry.product_id,
+    contact: { name: inquiry.contact_name, email: inquiry.contact_email, notes: inquiry.contact_notes },
+  })
+
+  const resendApiKey = Deno.env.get('RESEND_API_KEY')
+  await fetch('https://api.resend.com/emails', {
+    method: 'POST',
+    headers: {
+      Authorization: `Bearer ${resendApiKey}`,
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify({ from: FROM_ADDRESS, to: MIRA_EMAIL, subject, html }),
+  })
+
+  return new Response(JSON.stringify({ ok: true }), { headers: { 'Content-Type': 'application/json' } })
+})