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In this PR, I fixed a bug in the Mcp Server Plugin, a bug in the Mcp Client, and two issues in the implementation of mcp examples. The details are as follows:

1. When registering a Selector with the path "/mcp/" in the Mcp Server Selector, the actual key created for the mcpServer is "/mcp/". However, when modifying the Rule to add a tool, the lookup path is "/mcp", which causes the tool to not be added correctly.
2. The Mcp Client could not add the Context Path to the tool's URL.
3. There was an issue with the case sensitivity of the HTTP GET method configuration in the Mcp example.
4. The context path was modified in the Mcp example.