feat(02-02): add CardTheme enum and CardButton dataclass

- CardTheme enum with SUCCESS (green), ERROR (red), INFO (blue), WARNING (orange)
- CardButton dataclass with text, value dict, and button_type

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gsd-openclaw/src/gsd_openclaw/response_formatter.py

@@ -0,0 +1,25 @@
+"""
+Response formatter for Feishu Card messages.
+
+This module provides classes for formatting responses as Feishu Card JSON 2.0
+messages with three-zone structure (header/content/actions).
+"""
+from dataclasses import dataclass
+from typing import Dict, Any, List, Optional
+from enum import Enum
+
+
+class CardTheme(Enum):
+    """Theme colors for Feishu Card messages."""
+    SUCCESS = "green"
+    ERROR = "red"
+    INFO = "blue"
+    WARNING = "orange"
+
+
+@dataclass
+class CardButton:
+    """Interactive button for Feishu Card actions."""
+    text: str
+    value: Dict[str, Any]
+    button_type: str = "primary"  # primary, default, danger