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/common/mcp_process.rs

@@ -45,6 +45,7 @@ use codex_app_server_protocol::JSONRPCMessage;
 use codex_app_server_protocol::JSONRPCNotification;
 use codex_app_server_protocol::JSONRPCRequest;
 use codex_app_server_protocol::JSONRPCResponse;
+use codex_app_server_protocol::ListMcpServerStatusParams;
 use codex_app_server_protocol::LoginAccountParams;
 use codex_app_server_protocol::MockExperimentalMethodParams;
 use codex_app_server_protocol::ModelListParams;
@@ -526,6 +527,15 @@ impl McpProcess {
         self.send_request("plugin/read", params).await
     }
 
+    /// Send an `mcpServerStatus/list` JSON-RPC request.
+    pub async fn send_list_mcp_server_status_request(
+        &mut self,
+        params: ListMcpServerStatusParams,
+    ) -> anyhow::Result<i64> {
+        let params = Some(serde_json::to_value(params)?);
+        self.send_request("mcpServerStatus/list", params).await
+    }
+
     /// Send a JSON-RPC request with raw params for protocol-level validation tests.
     pub async fn send_raw_request(
         &mut self,