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/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.48.2";
+export const APP_VERSION = "0.49.0";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.49.0",
+    date: "2026-07-18 12:30",
+    added: [
+      "New Support page — report a bug, share a suggestion, or ask a question right from the app. Submissions email you a confirmation and (if an admin has configured a Gitea repo in Settings) automatically open a tracked issue. Admins get a Support section in the admin panel to triage tickets and retry issue creation.",
+    ],
+  },
   {
     version: "0.48.2",
     date: "2026-07-18 11:15",