chore: import Local-Cursor v1.1.8 source snapshot

Includes the current working directory changes. Historical commits and release binaries are excluded to limit Gitea storage.
Source base: d7515973fbfd6dd2001fa156c483455b8081c7cb

internal/backend/forwarder/reasoning_metadata.go

@@ -0,0 +1,16 @@
+// reasoning_metadata.go 保存 history/replay 共用的 reasoning metadata 判定。
+package forwarder
+
+import (
+	"strings"
+
+	modeladapter "cursor/internal/backend/agent/model"
+)
+
+func hasReplayableReasoningPayload(reasoningContent string, reasoningSignature string, reasoningSignatureSource string) bool {
+	if strings.TrimSpace(reasoningContent) != "" {
+		return true
+	}
+	return strings.TrimSpace(reasoningSignature) != "" &&
+		strings.TrimSpace(reasoningSignatureSource) == modeladapter.ReasoningSignatureSourceOpenAIResponses
+}