Merge feature/split-signal-improvements into combined branch

Combines Signal split/merge improvements with keycloak auth,
baileys-7 updates, and signal notifications support.

Resolved conflicts:
- Kept LID user ID support in bridge-whatsapp
- Kept bridge-dev.yml docker compose addition
- Used 3.5.0-beta.1 version from split-signal-improvements

docker/scripts/docker.js

@@ -26,6 +26,7 @@ if (devAppsWithZammad.includes(app) && files[app].includes('zammad')) {
   finalFiles.push('-f', 'docker-compose.bridge-dev.yml');
 }
 
+
 const finalCommand = command === "up" ? ["up", "-d", "--remove-orphans"] : [command];
 const dockerCompose = spawn('docker', ['compose', '--env-file', envFile, ...finalFiles, ...finalCommand]);