fix(openai): 透传OAuth强制store/stream并修复Codex识别

backend/internal/pkg/openai/request_test.go

@@ -0,0 +1,28 @@
+package openai
+
+import "testing"
+
+func TestIsCodexCLIRequest(t *testing.T) {
+	tests := []struct {
+		name string
+		ua   string
+		want bool
+	}{
+		{name: "codex_cli_rs 前缀", ua: "codex_cli_rs/0.1.0", want: true},
+		{name: "codex_vscode 前缀", ua: "codex_vscode/1.2.3", want: true},
+		{name: "大小写混合", ua: "Codex_CLI_Rs/0.1.0", want: true},
+		{name: "复合 UA 包含 codex", ua: "Mozilla/5.0 codex_cli_rs/0.1.0", want: true},
+		{name: "空白包裹", ua: "  codex_vscode/1.2.3  ", want: true},
+		{name: "非 codex", ua: "curl/8.0.1", want: false},
+		{name: "空字符串", ua: "", want: false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := IsCodexCLIRequest(tt.ua)
+			if got != tt.want {
+				t.Fatalf("IsCodexCLIRequest(%q) = %v, want %v", tt.ua, got, tt.want)
+			}
+		})
+	}
+}