feat: Enhanced multi-chain tools invocation capabilities, refer to Cherry Studio for reference.

[AlbertNie]

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Problem Description

I have configured multiple MCP Servers. When users ask questions, they typically require sequential invocation of multiple MCP servers to obtain the final answer. However, the OpenWebUI + MCPo setup is underperforming. From observations, the large model stops after invoking MCPo twice and provides an incorrect answer. Additionally, the thinking and invocation processes are not displayed in real-time during the process. In contrast, Cherry Studio works differently: it allows the large model to first retrieve the tools list, then deliberate which interface to invoke first. After obtaining the result, it continues to deliberate which interface to invoke next based on the result, proceeding step-by-step until the correct answer is provided. All these invocation steps are executed in a continuous and transparent manner.

Desired Solution you'd like

I hope that OpenWebUI can achieve MCP capabilities equivalent to those of Cherry Studio.

Alternatives Considered

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Additional Context

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