Extract emails into separate package with clean interface

- Create packages/emails/ with EmailClient interface abstraction
- Wrap Postmark ServerClient in adapter for clean typing
- Add createLoggingEmailClient for dev mode (logs to console)
- Split email templates into individual files with full test coverage
- Update api-server to use new package via context injection
- Remove EMAIL_DEV_MODE - now uses POSTMARK_API_KEY presence
- Delete apps/api-server/src/utils/email.ts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/emails/src/helpers.ts

@@ -0,0 +1,54 @@
+import { DurationFormat } from "@formatjs/intl-durationformat";
+import type { OrgRole } from "@reviq/db-schema";
+
+export function buildUrl(
+  baseUrl: string,
+  path: string,
+  params: Record<string, string>,
+): string {
+  const url = new URL(path, baseUrl);
+  for (const [key, value] of Object.entries(params)) {
+    url.searchParams.set(key, value);
+  }
+  return url.toString();
+}
+
+export function escapeHtml(unsafe: string): string {
+  return unsafe
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#039;");
+}
+
+const durationFormatter = new DurationFormat("en", { style: "long" });
+
+export function formatExpiryHours(hours: number): string {
+  return durationFormatter.format({ hours });
+}
+
+export function formatExpiryMinutes(minutes: number): string {
+  return durationFormatter.format({ minutes });
+}
+
+export function formatExpiryDays(days: number): string {
+  return durationFormatter.format({ days });
+}
+
+const roleLabels: Record<OrgRole, string> = {
+  owner: "Owner",
+  admin: "Admin",
+  member: "Member",
+};
+
+export function formatRoleDisplay(role: OrgRole): string {
+  return roleLabels[role];
+}
+
+export function getArticleForRole(role: OrgRole): string {
+  if (role === "owner" || role === "admin") {
+    return "an";
+  }
+  return "a";
+}