ci(issue-form): auto-populate version dropdown from GitHub releases

Replaces the broken update workflow (it targeted a non-existent bug_report.yml
via the npm-based populate action; Streamyfin isn't on npm) with
scripts/update-issue-form.mjs (Bun, dep-free): reads release tags via gh and
rewrites the 'version' dropdown in issue_report.yml, preserving sentinels
(older, TestFlight/Development build), newest-first, capped at
ISSUE_FORM_LIMIT (5) — so each new release rotates the oldest entry out.

Drafts/prereleases are included on purpose: release.yml drafts
v<app.json version> for every TestFlight (iOS) / beta (Android) build, and the
app shows that nativeApplicationVersion to users (UserInfo.tsx), so those
in-flight versions must be selectable. Runs on release events + a weekly cron
safety net + workflow_dispatch, opens a PR and enables auto-merge. Seeds the
current versions.

.github/ISSUE_TEMPLATE/issue_report.yml

@@ -77,10 +77,12 @@ body:
       label: Streamyfin Version
       description: What version of Streamyfin are you running?
       options:
+        - 0.54.1 (TestFlight)
+        - 0.51.0
         - 0.47.1
         - 0.30.2
+        - 0.28.0
         - older
-        - TestFlight/Development build
     validations:
       required: true