chore: rename integration branch from beta to dev

Update CI/CD configuration, documentation, and scripts to use dev as the
primary integration branch instead of beta. Changes include GitHub Actions
workflow triggers, semantic-release configuration, and all relevant
documentation and helper scripts.

.github/workflows/release.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches:
       - main
-      - beta
+      - dev
   workflow_dispatch:
 
 jobs: