[Feature Request] Support custom MCP

[easingthemes]

🥰 Feature Description

Currently only MCP from market can be used.
Support adding custom local MCP.

🧐 Proposed Solution

It already works by manually editing mcp json, so only simple UI is missing.

📝 Additional Information

No response

[tan-yong-sheng]

Request to support streamable http as well, thanks

If not mistakened, mcp_config.json currently supports stdio transport only.

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Edited:
nextchat.club supports streamable https mcp but it seems not yet for current repo: #6431