ci: dependabot auto-merge with compatibility checks

[dogancanbakir]

Fixes #211

Adds dependabot.yml and the shared auto-merge workflow from HappyHackingSpace/actions@v1. Majors stay for review.

Replaces the old Dependabot auto-merge workflow.

Summary by CodeRabbit

• Chores
  • Dependency updates now have a three-day cooldown, with minor and patch updates grouped for Go modules, GitHub Actions, Docker, and Docker Compose.
  • Replaced the previous post-check auto-merge workflow with one that runs for Dependabot pull requests when they’re opened, updated, or reopened.

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⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: b3e1465c-f810-4577-be01-5def7c7c6b15

📥 Commits

Reviewing files that changed from the base of the PR and between 66dbc40 and 4becc08.

📒 Files selected for processing (3)

• .github/dependabot.yml
• .github/workflows/dependabot-auto-merge.yaml
• .github/workflows/dependabot.yaml

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