chore: upgrade api7 and gateway to v3.9.19

[jarvis9443]

Version bump only, on release/3.9 because 3.9 is no longer the latest line.

chart	version	appVersion
api7ee3	3.9.5 → 3.9.6	3.9.18 → 3.9.19
gateway	3.9.10 → 3.9.11	3.9.18 → 3.9.19

Image tags move to v3.9.19 for dashboard, dp_manager, developer_portal and file_server, and to 3.9.19 for the gateway. READMEs regenerated with the go install build of helm-docs so no Autogenerated from chart metadata footer is added.

No structural sync was needed. The control plane's own helm/ directory is unchanged between v3.9.18 and v3.9.19. The gateway's config-default.yaml gained one key, nginx_config.stream.metrics_zone_size, which the 3.10 line's chart does not expose either; its default of 1m covers any realistic number of stream listening addresses, so there is nothing for a user to tune. This matches the shape of the 3.10.6 chart PR (#355), which was also version-bump-only.

Verified locally: helm lint charts/gateway passes, and the config.yaml rendered from the gateway ConfigMap validates against the real image — docker run --rm --entrypoint sh -v $PWD/config.yaml:/usr/local/apisix/conf/config.yaml api7/api7-ee-3-gateway:3.9.19 -c 'apisix init' exits 0. All images this chart pins are published on Docker Hub, so the ct install job has everything it needs.

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