feat: OpenClaw WebSocket integration with workspace file preview

- Migrate OpenClaw from HTTP (port 8004) to WebSocket (port 18789)
- Add workspace file list and content preview handlers
- Add OpenClawStatus component with agent/skills view
- Add OpenClawView panel in trader interface
- Add Zustand store for OpenClaw state management
- Fix gateway logging noise (yfinance, websockets)
- Fix RunWorkspaceManager.get_agent_asset_dir attribute error
- Handle missing workspace files gracefully in preview

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

shared/models/__init__.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+"""Shared data models."""
+
+from shared.models.openclaw import (
+    OpenClawStatus,
+    SessionEntry,
+    SessionHistory,
+    SessionHistoryEvent,
+    SessionsList,
+    CronJob,
+    CronList,
+    ApprovalRequest,
+    ApprovalsList,
+    normalize_status,
+    normalize_sessions,
+    normalize_session_history,
+    normalize_cron_jobs,
+    normalize_approvals,
+)
+
+__all__ = [
+    "OpenClawStatus",
+    "SessionEntry",
+    "SessionHistory",
+    "SessionHistoryEvent",
+    "SessionsList",
+    "CronJob",
+    "CronList",
+    "ApprovalRequest",
+    "ApprovalsList",
+    "normalize_status",
+    "normalize_sessions",
+    "normalize_session_history",
+    "normalize_cron_jobs",
+    "normalize_approvals",
+]