* Add MCP server installation via URL protocol
Implement handler for cherrystudio://mcp/install URLs to add MCP servers
from encoded configuration data. Supports multiple server configuration
formats and adds a new IPC channel for server addition.
* feat: Enhance MCP protocol handling and navigation
- Implemented navigation to the '/settings/mcp' page using executeJavaScript in the MCP protocol URL handler.
- Updated NavigationService to expose the navigate function globally for easier access in the application.
- Added NavigateFunction type to the global environment for improved type safety in navigation operations.
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Co-authored-by: kangfenmao <kangfenmao@qq.com>
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