feat: add option to clear service credentials

[GeiserX]

Summary

• Adds DELETE /api/config/{slug} endpoint to remove all stored credentials and signup bonus for a service
• Cleans up auto-created "external" deployment records for non-Docker services (e.g. Salad, Grass)
• Adds "Clear Credentials" button in Settings > Earnings Collection for configured services
• Adds "Clear" button in the credential modal (from dashboard)

Closes #22

Changes

• app/database.py — new delete_config_keys() function
• app/main.py — new DELETE /api/config/{slug} route
• app/static/js/app.js — clearServiceCredentials() function, UI buttons in both settings and modal

Test plan

• ruff check passes
• CI tests pass
• Configure a service, verify "Clear Credentials" button appears
• Click clear, confirm dialog, verify credentials removed and badge changes to "Not configured"
• For external services (no Docker), verify deployment record is also removed

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5148b677-0cd0-4156-923e-a39a7ee7851f

📥 Commits

Reviewing files that changed from the base of the PR and between 6c6f7de and 258afbb.

📒 Files selected for processing (3)

• app/database.py
• app/main.py
• app/static/js/app.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/clear-service-credentials

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