fix(mcp): use --url for codex CLI HTTP MCP setup

Codex CLI takes --url for HTTP MCP servers, not --transport http
(that's Claude Code's flag). The previous setup command exited with
'unexpected argument --transport' for anyone following the docs.
Spotted in PR review.

Author: caiopizzol

README.md

@@ -34,7 +34,7 @@ claude mcp add --transport http ooxml https://api.ooxml.dev/mcp
 **Codex CLI**
 
 ```bash
-codex mcp add ooxml --transport http https://api.ooxml.dev/mcp
+codex mcp add ooxml --url https://api.ooxml.dev/mcp
 ```
 
 Or in `~/.codex/config.toml`:

apps/mcp-server/README.md

@@ -18,7 +18,7 @@ claude mcp add --transport http ooxml https://api.ooxml.dev/mcp
 ### Codex CLI
 
 ```bash
-codex mcp add ooxml --transport http https://api.ooxml.dev/mcp
+codex mcp add ooxml --url https://api.ooxml.dev/mcp
 ```
 
 Or add to `~/.codex/config.toml`:

apps/web/src/pages/Mcp.tsx

@@ -6,7 +6,7 @@ import { useDocumentTitle } from "../hooks/useDocumentTitle";
 
 const MCP_ENDPOINT = `${import.meta.env.VITE_API_URL}/mcp`;
 const CLAUDE_COMMAND = `claude mcp add --transport http ooxml ${MCP_ENDPOINT}`;
-const CODEX_COMMAND = `codex mcp add ooxml --transport http ${MCP_ENDPOINT}`;
+const CODEX_COMMAND = `codex mcp add ooxml --url ${MCP_ENDPOINT}`;
 const CODEX_TOML = `[mcp_servers.ooxml]
 url = "${MCP_ENDPOINT}"`;