fix: embed images inline in Gitea issues, fix retry dropping attachments (v0.51.6)

Two related bugs in the Gitea issue body:

1. Attachments were always plain bullet links (`- url`), even for images —
   so they never rendered as a preview in the Gitea issue, just a clickable
   URL. Image content-types now use markdown image embed (`![](url)`).
2. The admin "Create Gitea issue" retry action built its own body from
   scratch (`ticket.description` only) and never queried attachments at
   all — a retry always lost them, regardless of point 1's fix.

Extracted buildGiteaIssueBody() to lib/gitea.ts so both the initial
ticket-creation path and the retry path share one body-building
implementation instead of two independent (and inevitably diverging) ones.

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

apps/web/app/api/v1/admin/support/[id]/route.ts

@@ -1,8 +1,8 @@
 import { NextRequest, NextResponse } from "next/server";
 import { z } from "zod";
-import { db, supportTickets, eq } from "@epicure/db";
+import { db, supportTickets, supportTicketAttachments, eq } from "@epicure/db";
 import { requireAdmin } from "@/lib/api-auth";
-import { createGiteaIssue } from "@/lib/gitea";
+import { createGiteaIssue, buildGiteaIssueBody } from "@/lib/gitea";
 
 const UpdateTicketBody = z.object({
   status: z.enum(["open", "triaged", "closed"]).optional(),
@@ -30,10 +30,15 @@ export async function PATCH(req: NextRequest, { params }: { params: Promise<{ id
   }
 
   if (parsed.data.retryGitea) {
+    const attachments = await db
+      .select({ key: supportTicketAttachments.storageKey, contentType: supportTicketAttachments.contentType })
+      .from(supportTicketAttachments)
+      .where(eq(supportTicketAttachments.ticketId, id));
+
     const { url, error } = await createGiteaIssue({
       type: ticket.type,
       title: ticket.title,
-      body: `${ticket.description}\n\n---\nReported via Epicure support form by user \`${ticket.userId}\`.`,
+      body: buildGiteaIssueBody({ description: ticket.description, userId: ticket.userId, attachments }),
     });
     updates.giteaIssueUrl = url;
     updates.giteaError = error;