fix(*): 创作工作台 - 修复 Agent、资源引用、附件交互与 Agnes 视频协议

backend/internal/service/provider.go

@@ -2062,7 +2062,11 @@ func executeProtocolRequest(ctx context.Context, config providerConfig, spec pro
 		}
 		body = bytes.NewReader(data)
 	}
-	req, err := http.NewRequestWithContext(ctx, method, apiURL(config.BaseURL, spec.Path), body)
+	requestURL, err := protocolRequestURL(config.BaseURL, spec)
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, method, requestURL, body)
 	if err != nil {
 		return nil, err
 	}
@@ -2078,6 +2082,25 @@ func executeProtocolRequest(ctx context.Context, config providerConfig, spec pro
 	return data, err
 }
 
+func protocolRequestURL(baseURL string, spec protocol.RequestSpec) (string, error) {
+	if !spec.OriginPath {
+		return apiURL(baseURL, spec.Path), nil
+	}
+	base, err := url.Parse(strings.TrimSpace(baseURL))
+	if err != nil || base.Scheme == "" || base.Host == "" {
+		return "", fmt.Errorf("协议根路径请求的 Base URL 无效")
+	}
+	requestPath, err := url.Parse(spec.Path)
+	if err != nil || !strings.HasPrefix(requestPath.Path, "/") {
+		return "", fmt.Errorf("协议根路径请求必须使用绝对路径")
+	}
+	base.Path = requestPath.Path
+	base.RawPath = requestPath.RawPath
+	base.RawQuery = requestPath.RawQuery
+	base.Fragment = ""
+	return base.String(), nil
+}
+
 func finishProtocolResult(ctx context.Context, config providerConfig, mode string, result *protocol.Result) (map[string]interface{}, error) {
 	if result == nil {
 		return nil, errors.New("声明式协议已完成但没有返回结果")

backend/internal/service/provider_test.go

@@ -17,6 +17,7 @@ import (
 	"time"
 
 	"infinite-canvas/backend/internal/model"
+	"infinite-canvas/backend/internal/protocol"
 )
 
 const testReferenceImageDataURL = "data:image/png;base64,aGVsbG8="
@@ -76,6 +77,16 @@ func TestChannelAPIURLForProtocolUsesGeminiDefault(t *testing.T) {
 	}
 }
 
+func TestProtocolRequestURLCanResolveSameOriginRootPath(t *testing.T) {
+	got, err := protocolRequestURL("https://apihub.agnes-ai.com/v1", protocol.RequestSpec{Path: "/agnesapi?video_id=video-1&model_name=agnes-video-2.5", OriginPath: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != "https://apihub.agnes-ai.com/agnesapi?video_id=video-1&model_name=agnes-video-2.5" {
+		t.Fatalf("root path URL = %q", got)
+	}
+}
+
 func TestSystemChannelIDFromBaseURLSupportsShortAndLegacyProxyPaths(t *testing.T) {
 	for _, test := range []struct{ base, want string }{
 		{base: "/api/channel-1", want: "channel-1"},