Fix MCP tool listing for hyphenated server names (#16674)

Addresses #16671 and #14927

Problem: `mcpServerStatus/list` rebuilt MCP tool groups from sanitized
tool prefixes but looked them up by unsanitized server names, so
hyphenated servers rendered as having no tools in `/mcp`. This was
reported as a regression when the TUI switched to use the app server.

Solution: Build each server's tool map using the original server name's
sanitized prefix, include effective runtime MCP servers in the status
response, and add a regression test for hyphenated server names.

codex-rs/app-server/tests/suite/v2/mod.rs

@@ -15,6 +15,7 @@ mod experimental_feature_list;
 mod fs;
 mod initialize;
 mod mcp_server_elicitation;
+mod mcp_server_status;
 mod model_list;
 mod output_schema;
 mod plan_item;