chore: drop Codeberg release workflow and document GitHub-only CI

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/CHANGELOG.md

@@ -7,6 +7,13 @@ All notable GoSentry changes are recorded in this file.
 **The remaining over-the-guideline source files are split; the roadmap is
 restructured around what actually blocks each item.**
 
+**Internal:**
+
+- **Codeberg / Forgejo Actions** — release publishing no longer targets
+  Codeberg. Removed `.forgejo/workflows/release.yml` and updated
+  `DEVELOPMENT.md` and `ci-build-release.sh` so CI is documented as GitHub
+  Actions only; Gitea remains `origin` with a pruning push mirror to GitHub.
+
 **Documentation:**
 
 - **`ROADMAP.md`** — reorganized into Features, Platform, Fyne/UI, and