Add CORS Configuration Management

[DokaIzk]

Title: feat: make CORS origins configurable via environment variable

Complexity: trivial
Time Estimate: 2-3 hours
Skills: Django, CORS

Description:
Currently CORS is hardcoded. Make it configurable:

• Add ALLOWED_ORIGINS environment variable
• Parse comma-separated list
• Apply to Django-CORS settings

Acceptance Criteria:

• CORS origins read from env var
• Supports multiple origins
• Works with localhost and production
• Tests verify configuration

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[midenotch]

@midenotch has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I've reviewed the issue and understand the requirements. I'd love to work on this and submit a clean PR that meets the acceptance criteria.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @midenotch to this issue.

[YfengJ]

Hi maintainers, I would like to work on this issue if it is still available.

I would keep the scope to Django CORS configuration only: parse an ALLOWED_ORIGINS environment variable, support multiple comma-separated origins, preserve safe localhost/dev behavior, add focused settings tests, and update env/docs examples if the repo has them.

I will wait for Stellar Wave or maintainer assignment before starting implementation.