v0.1.0 of flutter_ai_mcp

Model Context Protocol (MCP) integration for flutter_ai: connect to MCP servers over Streamable HTTP and expose their tools as flutter_ai tools that flow through the agent loop. Changelog excerpt: Initial release. - McpConnection/ McpToolInfo— a transport-agnostic contract for listing and calling MCP server tools. - StreamableHttpMcpConnection.connect(...)— connects to an MCP server over Streamable HTTP (the right transport for mobile/web), backed by mcp_client. - mcpToolSpecs(connection)— adapts discovered MCP tools into flutter_ai ToolSpecs so they register in a ToolRegistryand flow through the agent loop alongside native tools.