Feature Request: i18n support for web UI (Chinese localization)

[hyu18866]

Problem

The web UI (launched via --ui=true) has all labels, tooltips, and navigation text hardcoded in English. For non-English-speaking developers — especially in China, where MCP tooling is rapidly growing — this creates an unnecessary friction layer.

Proposal

Add basic i18n support to the embedded HTTP server:

1. Language detection: auto-detect via Accept-Language header, fallback to en
2. Config override: allow codebase-memory-mcp config set ui-lang zh to pin a language
3. Scope: start with UI chrome only — sidebar labels, search placeholder, tooltips, button text. Node labels remain as-is (source-derived metadata)

Motivation

• China has one of the largest developer populations globally
• MCP tooling adoption is accelerating in the Chinese AI coding community
• The graph data is language-agnostic — the UI shouldn't be the bottleneck

Willing to contribute

If you're open to this, I can help with the Chinese translation file — just point me to the template.

[DeusData]

Thanks for the thoughtful proposal — the UI-chrome-only scope (sidebar / search / tooltips / button text, leaving source-derived node labels untouched) is exactly the right boundary. Accept-Language detection with an en fallback plus a ui-lang config pin is a clean approach.

Labeling this enhancement / ux/behavior. A Chinese (zh) translation file would be very welcome — once the chrome strings are factored into a message catalog I'll point you at the template here.