fix: Earn.fm Supabase auth, exchange rates redirect, CSP

[GeiserX]

Summary

• Earn.fm collector rewritten: UUID token was for Docker client only, not API access. Now uses Supabase email/password auth → verified working ($5.71 balance)
• Exchange rates fixed: Frankfurter API returns 301 but httpx wasn't following redirects → only USD was available in currency selector
• CSP fix: Chart.js source map request to cdn.jsdelivr.net was blocked by connect-src 'self'

Test plan

• Earn.fm Supabase auth returns access token and balance ($5.71)
• Multi-currency dropdown populates after deploy
• Chart.js source map no longer blocked in console
• Bytelixir collector still works (path check fix from PR fix: Bytelixir collector rejects valid session at / #71)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: fce447dc-2557-40f2-9c94-64be8a4ca1b6

📥 Commits

Reviewing files that changed from the base of the PR and between 5e0c0a8 and 86bdd49.

📒 Files selected for processing (5)

• app/collectors/__init__.py
• app/collectors/earnfm.py
• app/exchange_rates.py
• app/main.py
• services/bandwidth/earnfm.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/earnfm-exchange-csp

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