feat(task): replace built-in task adaptors with a sandboxed JS plugin system (#7076)

dto/task_plugin.go

@@ -0,0 +1,23 @@
+package dto
+
+type TaskPluginError struct {
+	Code       string `json:"code"`
+	Message    string `json:"message"`
+	HTTPStatus int    `json:"httpStatus"`
+	Retryable  bool   `json:"retryable"`
+}
+
+// TaskView is the only persisted-task shape exposed to JavaScript plugins.
+// It deliberately excludes ownership, channel, quota, properties, and private
+// upstream identifiers.
+type TaskView struct {
+	TaskID     string `json:"task_id"`
+	Platform   string `json:"platform"`
+	Status     string `json:"status"`
+	Progress   string `json:"progress"`
+	FailReason string `json:"fail_reason"`
+	CreatedAt  int64  `json:"created_at"`
+	UpdatedAt  int64  `json:"updated_at,omitempty"`
+	FinishedAt int64  `json:"finished_at,omitempty"`
+	Data       any    `json:"data,omitempty"`
+}