Add release PR template (use via ?template=release.md)

Author: ch-bas

.github/PULL_REQUEST_TEMPLATE/release.md

@@ -0,0 +1,30 @@
+## Summary
+
+<!-- One-paragraph overview of what this release delivers -->
+
+### Added
+
+<!-- New brands, cameras, schema fields, frontend features.
+     Reference issues with "closes #N" to auto-close them on merge. -->
+
+-
+
+### Fixed
+
+<!-- Data corrections, removed fabricated configs, deduplication, audits -->
+
+-
+
+### Changed
+
+<!-- Schema migrations, workflow changes, breaking changes -->
+
+- Database: **X,XXX cameras across XX brands**
+
+## Checklist
+
+- [ ] `npm run build` passes — all cameras validate
+- [ ] `package.json` version bumped (release auto-creates tag + GitHub Release on merge)
+- [ ] CHANGELOG.md has a section for this version (used as release notes)
+- [ ] README.md stats synced (camera/brand counts, badges, brand table)
+- [ ] No fabricated specs — every new camera has a verifiable source URL