Add simple web-ui for kb-server configuration

[yashturkar]

Summary

Add a web UI for kb-server to support management, configuration, and monitoring of the system through a single admin surface.

Motivation

Today, setup and operations require working directly with .env values, vault/repo configuration, logs, and API internals. A web UI would make the system easier to configure, operate, and debug.

Proposed scope

• Initial setup flow for required configuration
• UI for viewing and editing all relevant .env fields
• Vault configuration and management
• Repo / Git integration settings
• Status dashboard for server, workers, and sync flows
• Monitoring for recent jobs, errors, and system health
• Visibility into pending changes / PR-related workflow state

Goals

• Make deployment and onboarding easier
• Centralize operational configuration in one place
• Improve observability for runtime health and failures
• Reduce manual setup and config mistakes

Notes

• This should be an admin / management UI, not a content editing surface
• Sensitive values should be handled securely
• State-changing actions should still respect the project’s PR-based approval model where applicable