Remove obsolete V1 terminology

[neubig]

Summary

• Renames V1-labeled agent-server modules, types, hooks, and component paths to neutral agent-server/conversation terminology.
• Fully removes obsolete V0/frontend legacy code paths, including core legacy event types, legacy chat renderers/helpers, socket.io subscription/mocking infrastructure, and legacy mock endpoints.
• Removes remaining frontend v1_enabled branching while preserving true external/API-version contracts such as /api/v1 endpoint paths, provider URLs, and third-party version strings.
• Updates regression coverage to assert current agent-server-only event handling and keep translation terminology from reintroducing V0/V1 conversation labels.

Testing

• npm run typecheck
• npm test
• npm run build
• git --no-pager diff --check && npm run typecheck

Fixes #70.

This PR was updated by an AI agent (OpenHands) on behalf of the user.

@neubig can click here to continue refining the PR

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Project	Deployment	Actions	Updated (UTC)
agent-server-gui	Ready	Preview, Comment	May 2, 2026 2:15am