chore: sync Gitea 28.2.0 inputs and compatibility docs

README.md

@@ -126,9 +126,11 @@ Open [http://127.0.0.1:3456](http://127.0.0.1:3456). The server watches theme fi
 
 ## Compatibility
 
-- **Latest tested:** Gitea 28.1.0
+- **Latest tested:** Gitea 28.2.0
+- **Source build baseline:** Gitea 28.2.0
 - **Latest release:** [v28.1.0](https://gitea.kenanzhu.com/KenanZhu/GiteaMailTemplates/releases/latest)
-- **Upstream Gitea 28.1.0:** [PASS]
+
+Gitea 28.2.0 introduces no mail template interface changes, so the published v28.1.0 templates remain compatible. Source builds use the locked v28.2.0 official inputs; see the [compatibility records](COMPATIBILITY.md).
 
 ## Project Directory Structure