ci: refresh service surface manifest for affiliate-marketing endpoint change

[cvsz]

Motivation

• The generated service surface manifest was out of sync after a new affiliate-marketing endpoint surfaced, causing CI's manifest drift check to fail.
• The documentation snapshot must match the regenerated manifest so endpoint counts and write-policy counts remain accurate.

Description

• Updated config/service-surface-manifest.json to include the new POST /v1/system/tiktok-shopee endpoint under the affiliate-marketing service and its corresponding write-policy entry.
• Updated the generated snapshot docs/development/feature-impact-dive-2026-04-06.md to reflect the new endpoint count and write-policy count for affiliate-marketing.

Testing

• Regenerated the manifest with python scripts/feature_impact_dive.py --write-manifest and confirmed the manifest file changed as expected.
• Validated the manifest with python scripts/feature_impact_dive.py --validate-manifest, which completed successfully and resolves the previous drift check failure.

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Codex Task

[gemini-code-assist]

Code Review

This pull request adds a new endpoint, POST /v1/system/tiktok-shopee, to the affiliate-marketing service. The changes include updating the service manifest with the new endpoint and its security requirements, as well as updating the corresponding documentation for endpoint counts and security policies. I have no feedback to provide.