feat: in-app support form with email + Gitea issue integration (v0.49.0)

Users can now report bugs, suggestions, or questions from a new /support
page. Each submission sends a confirmation email and, when GITEA_URL/
GITEA_TOKEN/GITEA_REPO are configured in admin Settings, opens a labeled
issue on that repo automatically (best-effort — failure doesn't block the
ticket). Admins get a Support section to triage status and retry failed
Gitea issue creation.

New support_tickets table, gitea.ts client, site-settings entries for the
three new secrets, and OpenAPI docs for the two user-facing endpoints.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/lib/email.ts

@@ -141,6 +141,24 @@ export function weeklyDigestHtml(opts: {
   );
 }
 
+export function supportTicketReceivedHtml(opts: {
+  type: string;
+  title: string;
+  ticketUrl: string;
+  giteaIssueUrl: string | null;
+}) {
+  const { type, title, ticketUrl, giteaIssueUrl } = opts;
+  const typeLabel = type === "bug" ? "bug report" : type === "suggestion" ? "suggestion" : "question";
+  return layout(
+    "We got your message — Epicure",
+    `<h1 style="margin:0 0 8px;font-size:24px;">Thanks for reaching out</h1>
+     <p style="margin:0 0 4px;color:#57534e;line-height:1.6;">We received your ${typeLabel}:</p>
+     <p style="margin:16px 0;padding:12px 16px;background:#fafaf9;border-radius:8px;border:1px solid #e7e5e4;font-weight:600;">${title}</p>
+     <p style="margin:0 0 4px;color:#57534e;line-height:1.6;">We'll follow up if we need more details.${giteaIssueUrl ? " It's also been logged for tracking." : ""}</p>
+     ${btn(ticketUrl, "View your ticket")}`
+  );
+}
+
 export function welcomeHtml(name: string) {
   return layout(
     "Welcome to Epicure",