feat(kling): 接入O1与3.0 Omni兼容接口

新增中国区可灵 V1 AK/SK Omni 协议与 API 2.0 兼容路径，补齐任务隔离、外部任务幂等、参数校验和 OpenAPI 文档。\n\n验证：O1 与 3.0 Omni 真实 V1 任务成功；Go、前端、依赖审计、迁移及 CI 脚本门禁通过。

apps/api/internal/clients/clients_test.go

@@ -2612,6 +2612,47 @@ func TestKelingOmniPayloadConvertsGatewayContent(t *testing.T) {
 	}
 }
 
+func TestKelingOmniPayloadPreservesLegacyV1Options(t *testing.T) {
+	payload, cleanupIDs, err := (KelingClient{}).kelingOmniPayload(context.Background(), Request{
+		Kind:      "videos.generations",
+		ModelType: "omni_video",
+		Body: map[string]any{
+			"multi_shot": true,
+			"shot_type":  "customize",
+			"multi_prompt": []any{
+				map[string]any{"index": 1, "prompt": "镜头一", "duration": 7},
+				map[string]any{"index": 2, "prompt": "镜头二", "duration": 8},
+			},
+			"resolution":       "1080p",
+			"callback_url":     "https://example.com/callback",
+			"external_task_id": "client-task-1",
+			"watermark_info":   map[string]any{"enabled": true},
+			"voice_list":       []any{map[string]any{"voice_id": "voice-1"}},
+		},
+		Candidate: store.RuntimeModelCandidate{
+			Provider:          "keling",
+			ProviderModelName: "kling-v3-omni",
+			Capabilities:      map[string]any{"omni_video": map[string]any{}},
+		},
+	}, "token")
+	if err != nil {
+		t.Fatalf("build keling legacy V1 payload: %v", err)
+	}
+	if len(cleanupIDs) != 0 {
+		t.Fatalf("unexpected cleanup ids: %+v", cleanupIDs)
+	}
+	if payload["multi_shot"] != true || payload["shot_type"] != "customize" || payload["duration"] != "15" {
+		t.Fatalf("unexpected multi-shot payload: %+v", payload)
+	}
+	if payload["callback_url"] != "https://example.com/callback" || payload["external_task_id"] != "client-task-1" {
+		t.Fatalf("legacy task options were not preserved: %+v", payload)
+	}
+	watermark := mapFromAny(payload["watermark_info"])
+	if watermark["enabled"] != true || len(mapListFromAny(payload["voice_list"])) != 1 {
+		t.Fatalf("watermark or voice options were not preserved: %+v", payload)
+	}
+}
+
 func TestKelingClientVideoResumePollsWithoutSubmitting(t *testing.T) {
 	var submitCalled bool
 	var pollPath string