fix: add Apple Silicon (ARM64) compatibility for dev setup, update docs and scripts

[Mohit-Lakra]

What does this PR do?

• Adds platform emulation to docker-compose.dev.yml for Apple Silicon (ARM64) compatibility.
• Updates .env.sample with DOCKER_PLATFORM.
• Adds setup scripts for Unix/macOS and Windows.
• Updates README with troubleshooting and quick start instructions.
• Adds a dedicated Apple Silicon setup guide.

Why is this needed?

Fixes #308. Allows developers on Apple Silicon Macs to run the dev environment without architecture errors.

How to test?

• Run ./scripts/setup-dev.sh (Unix/macOS) or scripts\setup-dev.bat (Windows).
• Confirm the dev environment starts and the FOSSology server is accessible.

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Thank you for reviewing!

[ghost]

@bufferoverflow @wuan @maxhbr @bcornec Could someone please review this pull request at their convenience?