feat(mcp): enable Serena web dashboard with auto-open browser

Add --enable-web-dashboard and --open-web-dashboard flags to
automatically open the Serena dashboard in browser on Codex startup,
matching the behavior in Claude Code.

Author: rldyourmnd

codex/os/linux/runtime/config/config.template.toml

@@ -29,4 +29,4 @@ args = ["-y", "chrome-devtools-mcp@latest"]
 
 [mcp_servers.serena]
 command = "uvx"
-args = ["--from", "git+https://github.com/oraios/serena", "serena", "start-mcp-server", "--context", "codex"]
+args = ["--from", "git+https://github.com/oraios/serena", "serena", "start-mcp-server", "--context", "codex", "--enable-web-dashboard", "--open-web-dashboard"]