fix(acceptance): 阻断本地控制面漂移污染验收

本地 K3s 节点此前在 Kubelet 中登记为宿主机资源，负载可挤压 etcd 并在 server 重启后继续污染同一 Run。现在为三节点设置真实可调度预算、独立 etcd/数据卷和锁定依赖镜像，并持续核对 server 与 API/etcd 健康。\n\n每次验收生成独立 Run ID，报告使用独占或原子写入，负载错误记录具体阶段；数据库鉴权不可用返回带 Retry-After 的 503，避免基础设施故障被误报为 401。\n\n验证：Go 全量测试、go vet、gofmt、OpenAPI、bash -n、ShellCheck、报告测试和 k3d 配置解析均通过。

apps/api/docs/swagger.json

@@ -5443,6 +5443,12 @@
                         "schema": {
                             "$ref": "#/definitions/httpapi.EasyAIGeneratedResponse"
                         }
+                    },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
                     }
                 }
             }
@@ -6323,6 +6329,12 @@
                         "schema": {
                             "$ref": "#/definitions/httpapi.VolcesErrorEnvelope"
                         }
+                    },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.VolcesErrorEnvelope"
+                        }
                     }
                 }
             }
@@ -7405,6 +7417,12 @@
                         "schema": {
                             "$ref": "#/definitions/httpapi.GeminiErrorEnvelope"
                         }
+                    },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.GeminiErrorEnvelope"
+                        }
                     }
                 }
             }
@@ -7478,6 +7496,12 @@
                         "schema": {
                             "$ref": "#/definitions/httpapi.GeminiErrorEnvelope"
                         }
+                    },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.GeminiErrorEnvelope"
+                        }
                     }
                 }
             }
@@ -7578,6 +7602,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "504": {
                         "description": "Gateway Timeout",
                         "schema": {
@@ -8446,6 +8476,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "504": {
                         "description": "Gateway Timeout",
                         "schema": {
@@ -8551,6 +8587,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "504": {
                         "description": "Gateway Timeout",
                         "schema": {
@@ -8999,6 +9041,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "504": {
                         "description": "Gateway Timeout",
                         "schema": {
@@ -9324,6 +9372,12 @@
                             "$ref": "#/definitions/httpapi.ErrorEnvelope"
                         }
                     },
+                    "503": {
+                        "description": "Service Unavailable",
+                        "schema": {
+                            "$ref": "#/definitions/httpapi.ErrorEnvelope"
+                        }
+                    },
                     "504": {
                         "description": "Gateway Timeout",
                         "schema": {