[Baoyuantop]

Summary

Backport #421 to release/3.9. Expose optional trafficDistribution values for the Dashboard, DP Manager, and Developer Portal Services.

Bump the api7ee3 chart to 3.9.12 and regenerate its README with the CI version of helm-docs.

Validation

• helm template omits spec.trafficDistribution on all three Services by default and renders PreferSameZone on all three when configured.
• Per-Service overrides render independently. An explicit empty value omits the field, and disabling Developer Portal still omits its Service.
• helm lint and the generated README check pass.

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