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/app/admin/layout.tsx

@@ -3,7 +3,7 @@ import { headers } from "next/headers";
 import { auth } from "@/lib/auth/server";
 import { db, users, eq } from "@epicure/db";
 import Link from "next/link";
-import { Shield, Users, BookOpen, Settings, BarChart3, ClipboardList, HardDrive, Bot, ArrowLeft, Gauge, Mail, Flag, History } from "lucide-react";
+import { Shield, Users, BookOpen, Settings, BarChart3, ClipboardList, HardDrive, Bot, ArrowLeft, Gauge, Mail, Flag, History, LifeBuoy } from "lucide-react";
 import { cn } from "@/lib/utils";
 
 const adminNav = [
@@ -12,6 +12,7 @@ const adminNav = [
   { href: "/admin/invites", label: "Invites", icon: Mail },
   { href: "/admin/recipes", label: "Recipes", icon: BookOpen },
   { href: "/admin/reports", label: "Reports", icon: Flag },
+  { href: "/admin/support", label: "Support", icon: LifeBuoy },
   { href: "/admin/tiers", label: "Tier Limits", icon: Gauge },
   { href: "/admin/audit-logs", label: "Audit Logs", icon: ClipboardList },
   { href: "/admin/storage", label: "Storage", icon: HardDrive },