ci: add version consistency check and fully automate release pipeline

- New tools/check_versions.sh: verifies version.txt, version.h, SylDaVersions.kt match
- release.yml: 'Verify version consistency' step after build, aborts release if mismatch
- ci.yml: same check after debug APK build
- scripts/release.sh: now runs full pipeline (pio run -> copy firmware -> gradle -> check)
  and refuses dirty working tree
- Untrack version.h, SylDaVersions.kt, release/ — always regenerated fresh from version.txt

Prevents the v1.1 bug where stale generated files caused version mismatch
and infinite re-flash loop.

.forgejo/workflows/ci.yml

@@ -46,6 +46,9 @@ jobs:
         env:
           ANDROID_HOME: ${{ vars.ANDROID_HOME || '/home/linuxbrew/.linuxbrew/share/android-commandlinetools' }}
 
+      - name: Verify version consistency
+        run: bash tools/check_versions.sh
+
       - name: Stage APK
         run: |
           mkdir -p /tmp/ci-artifacts