feat(api): add OpenAI compatibility for image models

- Introduced OpenAI-compatible image model support in the API, enabling integration through image generation and editing endpoints.
- Added registry type for OpenAIImageModelType to classify and validate compatibility.
- Implemented request handling for OpenAI-compatible image models, including JSON and multipart formats.
- Enhanced executor methods to support OpenAI-compatible image streaming and non-streaming requests.
- Included tests to validate model registration, streaming behavior, and multipart payload formatting.

sdk/cliproxy/service_excluded_models_test.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 	"testing"
 
+	internalregistry "github.com/router-for-me/CLIProxyAPI/v7/internal/registry"
 	coreauth "github.com/router-for-me/CLIProxyAPI/v7/sdk/cliproxy/auth"
 	"github.com/router-for-me/CLIProxyAPI/v7/sdk/config"
 )
@@ -63,3 +64,71 @@ func TestRegisterModelsForAuth_UsesPreMergedExcludedModelsAttribute(t *testing.T
 		t.Fatal("expected global excluded model to be present when attribute override is set")
 	}
 }
+
+func TestRegisterModelsForAuth_OpenAICompatibilityImageModelType(t *testing.T) {
+	service := &Service{
+		cfg: &config.Config{
+			OpenAICompatibility: []config.OpenAICompatibility{
+				{
+					Name:    "images",
+					BaseURL: "https://example.com/v1",
+					Models: []config.OpenAICompatibilityModel{
+						{Name: "upstream-image", Alias: "compat-image", Image: true},
+						{Name: "upstream-chat", Alias: "compat-chat"},
+					},
+				},
+			},
+		},
+	}
+	auth := &coreauth.Auth{
+		ID:       "auth-openai-compat-image",
+		Provider: "openai-compatibility",
+		Status:   coreauth.StatusActive,
+		Attributes: map[string]string{
+			"auth_kind":    "api_key",
+			"compat_name":  "images",
+			"provider_key": "images",
+		},
+	}
+
+	modelRegistry := internalregistry.GetGlobalRegistry()
+	modelRegistry.UnregisterClient(auth.ID)
+	t.Cleanup(func() {
+		modelRegistry.UnregisterClient(auth.ID)
+	})
+
+	service.registerModelsForAuth(auth)
+
+	models := modelRegistry.GetModelsForClient(auth.ID)
+	var imageModel *internalregistry.ModelInfo
+	var chatModel *internalregistry.ModelInfo
+	for _, model := range models {
+		if model == nil {
+			continue
+		}
+		switch strings.TrimSpace(model.ID) {
+		case "compat-image":
+			imageModel = model
+		case "compat-chat":
+			chatModel = model
+		}
+	}
+	if imageModel == nil {
+		t.Fatal("expected compat-image to be registered")
+	}
+	if imageModel.Type != internalregistry.OpenAIImageModelType {
+		t.Fatalf("image model type = %q, want %q", imageModel.Type, internalregistry.OpenAIImageModelType)
+	}
+	if imageModel.Thinking != nil {
+		t.Fatalf("image model thinking = %+v, want nil", imageModel.Thinking)
+	}
+	if chatModel == nil {
+		t.Fatal("expected compat-chat to be registered")
+	}
+	if chatModel.Type != "openai-compatibility" {
+		t.Fatalf("chat model type = %q, want openai-compatibility", chatModel.Type)
+	}
+	if chatModel.Thinking == nil {
+		t.Fatal("expected chat model to keep default thinking support")
+	}
+}