CrossRelay stage 2: Codex /v1/responses relay, config.toml manager, Codex page

internal/presets/presets.go

@@ -21,6 +21,7 @@ var All = []Preset{
 			Sonnet:  "deepseek-chat",
 			Haiku:   "deepseek-chat",
 			Opus:    "deepseek-chat",
+			Extra:   codexModelExtras("deepseek-chat"),
 		},
 	},
 	{
@@ -31,6 +32,7 @@ var All = []Preset{
 			Sonnet:  "kimi-k2-0905-preview",
 			Haiku:   "kimi-k2-0905-preview",
 			Opus:    "kimi-k2-0905-preview",
+			Extra:   codexModelExtras("kimi-k2-0905-preview"),
 		},
 	},
 	{
@@ -41,10 +43,22 @@ var All = []Preset{
 			Sonnet:  "glm-4.6",
 			Haiku:   "glm-4.6",
 			Opus:    "glm-4.6",
+			Extra:   codexModelExtras("glm-4.6"),
 		},
 	},
 }
 
+// codexModelExtras maps the model names Codex CLI asks for onto one
+// upstream model, so activating a preset for Codex works without manual
+// mapping.
+func codexModelExtras(upstream string) map[string]string {
+	return map[string]string{
+		"gpt-5-codex":       upstream,
+		"gpt-5":             upstream,
+		"codex-mini-latest": upstream,
+	}
+}
+
 // ByKey looks up a preset by its key.
 func ByKey(key string) (Preset, bool) {
 	for _, p := range All {

internal/presets/presets_test.go

@@ -0,0 +1,27 @@
+package presets
+
+import "testing"
+
+func TestPresetsCarryCodexModelExtras(t *testing.T) {
+	for _, p := range All {
+		for _, name := range []string{"gpt-5-codex", "gpt-5", "codex-mini-latest"} {
+			got, ok := p.Models.Extra[name]
+			if !ok {
+				t.Errorf("preset %q has no extra mapping for %q", p.Key, name)
+				continue
+			}
+			if got != p.Models.Default {
+				t.Errorf("preset %q maps %q to %q, want %q", p.Key, name, got, p.Models.Default)
+			}
+		}
+	}
+}
+
+func TestByKey(t *testing.T) {
+	if _, ok := ByKey("deepseek"); !ok {
+		t.Error("deepseek preset missing")
+	}
+	if _, ok := ByKey("nope"); ok {
+		t.Error("unknown preset resolved")
+	}
+}