feat: codex channel (#2652)

* feat: codex channel

* feat: codex channel

* feat: codex oauth flow

* feat: codex refresh cred

* feat: codex usage

* fix: codex err message detail

* fix: codex setting ui

* feat: codex refresh cred task

* fix: import err

* fix: codex store must be false

* fix: chat -> responses tool call

* fix: chat -> responses tool call

service/codex_wham_usage.go

@@ -0,0 +1,56 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+)
+
+func FetchCodexWhamUsage(
+	ctx context.Context,
+	client *http.Client,
+	baseURL string,
+	accessToken string,
+	accountID string,
+) (statusCode int, body []byte, err error) {
+	if client == nil {
+		return 0, nil, fmt.Errorf("nil http client")
+	}
+	bu := strings.TrimRight(strings.TrimSpace(baseURL), "/")
+	if bu == "" {
+		return 0, nil, fmt.Errorf("empty baseURL")
+	}
+	at := strings.TrimSpace(accessToken)
+	aid := strings.TrimSpace(accountID)
+	if at == "" {
+		return 0, nil, fmt.Errorf("empty accessToken")
+	}
+	if aid == "" {
+		return 0, nil, fmt.Errorf("empty accountID")
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, bu+"/backend-api/wham/usage", nil)
+	if err != nil {
+		return 0, nil, err
+	}
+	req.Header.Set("Authorization", "Bearer "+at)
+	req.Header.Set("chatgpt-account-id", aid)
+	req.Header.Set("Accept", "application/json")
+	if req.Header.Get("originator") == "" {
+		req.Header.Set("originator", "codex_cli_rs")
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return 0, nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err = io.ReadAll(resp.Body)
+	if err != nil {
+		return resp.StatusCode, nil, err
+	}
+	return resp.StatusCode, body, nil
+}