v0.9.1 : MCP Marketplace

[0.9.1]

Added

• Add MCP server marketplace for browsing and installing MCP servers (#835)
• Add location and type filters to the MCP marketplace dialog (#835)
• Add support for custom headers in HTTP MCP transports for authentication (#835)

Changed

• Refactor MCP integration to remove the core sub-module and use the official langchain4j-mcp artifact (#835)
• Remove legacy GitHub MCP and FileSystem MCP quick-action buttons from settings in favor of marketplace-driven setup (#835)

Fixed

• Issue #791: Escape triple braces in user content to prevent template variable exception (#834)