feat(chat): Sprint 4 -- Docker cleanup, frontend migration to Go WS
- Remove Rust chat-server from docker-compose.yml, staging.yml, prod.yml
- Remove VITE_WS_URL from docker frontend env vars (auto-derived from API_URL)
- Update env.ts: derive WS_URL from API_URL (/api/v1/ws) when not explicitly set
- Remove 127.0.0.1:8081 dev hack from useChat.ts
- Add missing types: EditMessage, DeleteMessage, FetchHistory, SearchMessages,
SyncMessages, MessageEdited, MessageDeleted, SearchResults, SyncChunk
- Update MSW chat/token handler to return ws_url: /api/v1/ws
- Update .env.example and .env.storybook
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