feat: add MCP bridge for AI agent integration

Localhost HTTP listener (dynamic port) allows MCP Server and other AI agents
to open tables directly in DBX UI via Tauri events.

src-tauri/src/commands/mod.rs

@@ -2,6 +2,7 @@ pub mod ai;
 pub mod connection;
 mod connection_secrets;
 pub mod history;
+pub mod mcp_bridge;
 pub mod mongo_cmd;
 pub mod query;
 pub mod query_cancel;