Implement GitHub Dependabot Configuration for Automated Vulnerability Scanning and resolution

### Objective

Automate vulnerability scanning and resolution for dependencies across the codebase by introducing a standard Dependabot configuration.

### Tasks & Requirements

Create and commit a `.github/dependabot.yml` configuration file to the root of the repository with the following specifications:

- **Security Updates:** Configure security updates to run **daily** for all relevant dependency ecosystems used in the project (e.g., `poetry` for Python/Flask, `pnpm` for Node/Firebase).
- **Version Updates:** Configure routine version updates on a **weekly** schedule to scan for non-vulnerable updates and keep dependencies current.
- **Default Reviewers:** Automatically assign the default reviewer group to the pull requests

Start by inspecting the repository's dependency manifests to confirm the Poetry and pnpm ecosystems, then create .github/dependabot.yml at the repository root. Configure daily security updates, weekly version updates, and the specified default reviewer group. The issue is done when the configuration is committed and covers all relevant ecosystems.

Written by the indexing model from the issue text.