feat: add file-server helm chart templates

[jarvis9443]

Summary

Add optional file-server component templates to the charts/api7/ helm chart.

What is file-server?

The file-server is a standalone binary that serves file downloads without authentication. It shares the same PostgreSQL database as the dashboard and dp-manager components.

Changes

• values.yaml: Added file_server, file_server_service, and file_server_configuration sections
• file-server-deploy.yaml: Deployment template (modeled after dp-manager, simplified — no TLS, no prometheus volumes)
• file-server-configmap.yaml: ConfigMap for file-server config
• file-server-service.yaml: ClusterIP service with single HTTP port

Notes

• Disabled by default (file_server.enabled: false) — existing deployments are unaffected
• Draft PR because the file-server Docker image (api7/api7-ee-file-server) is not published yet
• No test case added: this is a pure Helm template addition with no testable logic beyond helm template rendering, which is covered by the existing CI lint job

[CLAassistant]

All committers have signed the CLA.

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