chore: remove unused mcpLocal code in chatStore

[bittoby]

Closes: #959

Description

Fixes models not seeing or using installed MCPs (e.g. Firecrawl). The frontend was loading local MCP config from Electron but always sending an empty installed_mcp in the chat request, so the backend never received the real MCP list. The request body now sends the actual local MCP config when starting a chat so the backend can connect to MCP servers and expose their tools to the model.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[bittoby]

@Wendong-Fan @Pakchoioioi Please review this PR.

[bittoby]

@Wendong-Fan could you merge this pr?

[Wendong-Fan]

thanks @bittoby for the fix! LGTM

[Wendong-Fan]

Hi @bittoby, after investigating, I found that MCP functionality actually works correctly through the AddWorker path when users add an agent via AddWorker and select MCP tools, the new_agents[].mcp_tools is properly passed to the backend and processed

As @fengju0213 mentioned in the #959 (comment), the original issue might be a user configuration problem rather than a code bug, a cleaner approach might be to remove the unused mcpLocal code instead since it's loaded but never used, this would improve code quality without changing the intended behavior, i will update directly in your PR, WDYT?