[High Priority] Enable Dependabot for automated dependency updates

[Mossaka]

Context

From CI/CD Pipeline Gap Assessment (Discussion #227)

Description

Configure Dependabot to automatically create PRs for dependency updates, improving security and maintainability.

Acceptance Criteria

• Create dependabot configuration file
• Configure npm ecosystem scanning
• Set appropriate update schedule (e.g., weekly)
• Configure grouping rules for related dependencies
• Add Docker ecosystem scanning for container images

Estimated Effort

Approximately 30 minutes

Related

• Discussion CI/CD Pipeline and Integration Tests - Gap Assessment #227