ci: rebuild issue triage, PR labeler, and release note categories

Combined issue-translator (#299) and issue-deduplicator (#298) into a
single issue-triage.yml with deterministic translate→dedup sequencing
and split inference/mutation permissions per job.

Rebuilt pr-labeler (#301) with graceful label creation (creates missing
labels instead of failing) and live title refetch before mutation.

Added .github/release.yml category config for auto-generated notes.

Addresses all Sol review findings: deterministic sequencing, split
permissions, label prerequisites, BOM removal, EOF newlines.

Co-authored-by: Wibias <37517432+Wibias@users.noreply.github.com>
Based-on: PR #301, PR #298, PR #299

Author: lidge-jun

.github/release.yml

@@ -1,7 +1,3 @@
-# GitHub release notes category config.
-# Maps PR labels (applied by pr-labeler.yml) to release note section headings.
-# Docs: https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes
-
 changelog:
   exclude:
     labels: