ci: name build artifacts by branch and version code [version set]

Every build of a given semver was published as `pluriwave-v1.3.0.aab` into
the same folder, so main and PRO overwrote each other and three different
builds became indistinguishable once downloaded — the browser saves them as
"(1)", "(2)" and the version code is only visible by unzipping the bundle.

That cost two rejected uploads to Play Console for reusing a version code.
Artifacts are now `pluriwave-<branch>-v<semver>+<build>.<ext>", which
identifies itself weeks later and outside this repo.

.gitea/workflows/build.yml

@@ -237,11 +237,24 @@ jobs:
       - name: Build AAB release
         run: flutter build appbundle --release
 
+      # El nombre lleva RAMA y CÓDIGO DE VERSIÓN, no solo el semver.
+      #
+      # Antes, cada build de 1.3.0 se llamaba `pluriwave-v1.3.0.aab` y caía en
+      # la misma carpeta, así que main y PRO se pisaban y tres builds distintos
+      # eran indistinguibles una vez descargados: el navegador los guarda como
+      # "(1)", "(2)"... y ya no se sabe cuál es cuál. Eso costó subir a Play
+      # Console un código de versión ya usado, dos veces.
+      #
+      # Con `pluriwave-PRO-v1.3.0+156.aab` el archivo se identifica solo,
+      # incluso semanas después y fuera de este repo.
       - name: Publicar en ftl-builds (Zimaboard)
         run: |
           VERSION="${{ steps.version.outputs.version }}"
-          APK_NOMBRE="pluriwave-v${VERSION}.apk"
-          AAB_NOMBRE="pluriwave-v${VERSION}.aab"
+          BUILD_NUMBER="${{ steps.version.outputs.build_number }}"
+          BRANCH="${CURRENT_REF#refs/heads/}"
+          ETIQUETA="${BRANCH}-v${VERSION}+${BUILD_NUMBER}"
+          APK_NOMBRE="pluriwave-${ETIQUETA}.apk"
+          AAB_NOMBRE="pluriwave-${ETIQUETA}.aab"
           DESTINO="/opt/ftl-builds/builds/pluriwave/v${VERSION}"
           SSH_KEY="/Users/freetlab/.openclaw/workspace/.secure/zimaboard_ed25519"
 
@@ -252,8 +265,8 @@ jobs:
           scp -i "$SSH_KEY" -o StrictHostKeyChecking=no \
             build/app/outputs/bundle/release/app-release.aab \
             "ShanaiaBot@192.168.0.33:${DESTINO}/${AAB_NOMBRE}"
-          echo "✅ APK: builds.freetimelab.es → pluriwave → v${VERSION}"
-          echo "✅ AAB: builds.freetimelab.es → pluriwave → v${VERSION}"
+          echo "✅ APK: builds.freetimelab.es → pluriwave → v${VERSION} → ${APK_NOMBRE}"
+          echo "✅ AAB: builds.freetimelab.es → pluriwave → v${VERSION} → ${AAB_NOMBRE}"
 
       - name: Preparar credenciales de Google Play
         if: ${{ gitea.ref == 'refs/heads/PRO' }}