feat: file/screenshot attachments on support tickets (v0.49.1)

Support form now accepts up to 5 attachments (images, PDF, text, JSON,
zip; 10MB each) via the existing S3/MinIO presigned-upload flow. New
support_ticket_attachments table; attachment links get folded into the
Gitea issue body and shown as thumbnails in both the user's ticket
history and the admin support view.

New presign endpoint (/api/v1/support/attachments/presign, rate-limited
20/hr) scoped to the uploading user rather than a ticket id, since the
ticket doesn't exist yet at upload time.

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

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.49.0";
+export const APP_VERSION = "0.49.1";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.49.1",
+    date: "2026-07-18 13:10",
+    added: [
+      "Support form now accepts attachments — screenshots or files (images, PDF, text, JSON, zip; up to 5 files, 10MB each). They're linked in the confirmation email's Gitea issue and shown as thumbnails on your ticket history and in the admin support view.",
+    ],
+  },
   {
     version: "0.49.0",
     date: "2026-07-18 12:30",