🧹 Refactor buildCampaignRiskDecision to reduce complexity

[theRebelliousNerd]

🎯 What: Extracted logic from buildCampaignRiskDecision into smaller helper functions.
💡 Why: Reduces cognitive load and complexity, making the code more readable and maintainable.
✅ Verification: Ran the test suite for internal/campaign and the entire module. All tests passed.
✨ Result: Improved maintainability and clarity of risk scoring without changing the behavior.

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PR created automatically by Jules for task 7064846072443496118 started by @theRebelliousNerd

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3339f311-bb15-4291-b4e7-2d7d66b6e727

📥 Commits

Reviewing files that changed from the base of the PR and between cc0e10f and dd82cf7.

📒 Files selected for processing (1)

• internal/campaign/risk_scoring.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jules-7064846072443496118-83b1019f

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