Fix CI/CD pipeline failures: formatting violations and missing frontend Dockerfile

[Copilot]

Two jobs in the CI/CD pipeline were failing: Lint and Code Quality due to formatting violations, and Docker Build Test due to a missing frontend Dockerfile.

Changes

Python formatting and import sorting

• Applied Black formatter to 7 Python files (modules-python, gateway, tests)
• Applied isort to fix import ordering across same files

Frontend Docker configuration

• Created frontend/Dockerfile for Node.js 18 Alpine
• Copies package*.json for reproducible builds via lockfile

The docker-compose.yml already referenced frontend/Dockerfile but the file didn't exist, causing the build to fail with open Dockerfile: no such file or directory.

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