chore: prepare v1.27.3 release and guard template publishing

.github/release-notes/v1.27.2.md

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+> **Correction (2026-09-23):** v1.27.2 did not fix every push notification template. Bloom, Ember, and Heritage still used the old commit ID path and can fail to render push notifications on Gitea 1.27.1+. Use v1.27.3 for the fix.
+
+FEATURES
+
+- THEMES (Aurora)
+    - Add `email-text` class to release template paragraphs for consistent typography with the rest of the theme
+
+BUGFIXES
+
+- THEMES
+    - Update push commit data paths in seven themes for Gitea 1.27.1 compatibility (`.ID` → `.UserCommit.GitCommit.ID`); see the correction above for the three remaining themes
+    - Replace `rgba()` colors with `#RRGGBBAA` hex notation across all 10 themes
+
+DOCS
+
+- Track Gitea 1.27.0, 1.27.1, and 1.27.2 compatibility
+- Keep English and Simplified Chinese README and CONTRIBUTING files
+
+
+---
+
+**Full Changelog:** [v1.0.1...v1.27.2](https://github.com/KenanZhu/GiteaMailTemplates/compare/v1.0.1...v1.27.2)