feat(acceptance): 建立同构验收与弹性容量体系

实现本地三节点 K3s 同构环境、脱敏生产快照、Gemini 图片和多参考图视频协议模拟、统一验收报告及故障注入。\n\n新增 Worker 容量控制器、资源与连接预算、任务恢复保护，并将生产验收拆分为 validation 执行和人工 CAS 放量。\n\n验证包括 Go 全量测试、PostgreSQL HTTP 集成测试、go vet、OpenAPI、ShellCheck、前端检查、迁移及发布脚本测试。

apps/api/internal/acceptanceemulator/server_test.go

@@ -40,7 +40,11 @@ func TestGeminiAndVolcesProtocolEmulation(t *testing.T) {
 		}}},
 		"generationConfig": map[string]any{"responseModalities": []any{"IMAGE"}},
 	})
-	response, err := http.Post(httpServer.URL+"/v1beta/models/gemini-test:generateContent", "application/json", bytes.NewReader(geminiBody))
+	response, err := postIdempotent(
+		httpServer.URL+"/v1beta/models/gemini-test:generateContent",
+		geminiBody,
+		"gemini-task",
+	)
 	if err != nil {
 		t.Fatalf("Gemini request: %v", err)
 	}
@@ -76,7 +80,11 @@ func TestGeminiAndVolcesProtocolEmulation(t *testing.T) {
 		})
 	}
 	videoBody, _ := json.Marshal(map[string]any{"model": "seedance-test", "content": content, "seed": 1})
-	response, err = http.Post(httpServer.URL+"/contents/generations/tasks", "application/json", bytes.NewReader(videoBody))
+	response, err = postIdempotent(
+		httpServer.URL+"/contents/generations/tasks",
+		videoBody,
+		"video-task",
+	)
 	if err != nil {
 		t.Fatalf("submit video: %v", err)
 	}
@@ -159,7 +167,11 @@ func TestVolcesProtocolAcceptsThreeSixAndNineReferenceImages(t *testing.T) {
 			})
 		}
 		body, _ := json.Marshal(map[string]any{"model": "seedance-test", "content": content, "seed": imageCount})
-		response, err := http.Post(httpServer.URL+"/contents/generations/tasks", "application/json", bytes.NewReader(body))
+		response, err := postIdempotent(
+			httpServer.URL+"/contents/generations/tasks",
+			body,
+			fmt.Sprintf("video-%d", imageCount),
+		)
 		if err != nil {
 			t.Fatalf("%d-image submit: %v", imageCount, err)
 		}
@@ -184,3 +196,13 @@ func TestVolcesProtocolAcceptsThreeSixAndNineReferenceImages(t *testing.T) {
 		}
 	}
 }
+
+func postIdempotent(url string, body []byte, key string) (*http.Response, error) {
+	request, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+	request.Header.Set("Content-Type", "application/json")
+	request.Header.Set("Idempotency-Key", key)
+	return http.DefaultClient.Do(request)
+}