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>

backend/tests/test_openclaw_service_app.py

@@ -0,0 +1,110 @@
+# -*- coding: utf-8 -*-
+"""Tests for the extracted OpenClaw service app surface."""
+
+from fastapi.testclient import TestClient
+
+from backend.apps.openclaw_service import create_app
+from backend.api import openclaw as openclaw_module
+
+
+class _FakeOpenClawCliService:
+    def health(self):
+        return {
+            "status": "healthy",
+            "service": "openclaw-service",
+            "base_command": ["openclaw"],
+            "cwd": "/tmp/openclaw",
+            "binary_resolved": True,
+            "reference_entry_available": True,
+            "timeout_seconds": 15.0,
+        }
+
+    def status(self):
+        return {"runtimeVersion": "2026.3.24"}
+
+    def list_sessions(self):
+        return {
+            "sessions": [
+                {"key": "main/session-1", "agentId": "main"},
+                {"key": "analyst/session-2", "agentId": "analyst"},
+            ]
+        }
+
+    def get_session(self, session_key: str):
+        for session in self.list_sessions()["sessions"]:
+            if session["key"] == session_key:
+                return session
+        raise KeyError(session_key)
+
+    def get_session_history(self, session_key: str, *, limit: int = 20):
+        return {
+            "sessionKey": session_key,
+            "limit": limit,
+            "items": [{"role": "assistant", "text": "hello"}],
+        }
+
+    def list_cron_jobs(self):
+        return {"jobs": [{"id": "job-1", "name": "Daily sync"}]}
+
+    def list_approvals(self):
+        return {"approvals": [{"id": "ap-1", "status": "pending"}]}
+
+
+def test_openclaw_service_routes_are_exposed():
+    app = create_app()
+    paths = {route.path for route in app.routes}
+
+    assert "/health" in paths
+    assert "/api/status" in paths
+    assert "/api/openclaw/status" in paths
+    assert "/api/openclaw/sessions" in paths
+    assert "/api/openclaw/sessions/{session_key:path}" in paths
+    assert "/api/openclaw/sessions/{session_key:path}/history" in paths
+    assert "/api/openclaw/cron" in paths
+    assert "/api/openclaw/approvals" in paths
+
+
+def test_openclaw_service_read_routes():
+    app = create_app()
+    app.dependency_overrides[openclaw_module.get_openclaw_cli_service] = (
+        lambda: _FakeOpenClawCliService()
+    )
+
+    with TestClient(app) as client:
+        health = client.get("/health")
+        status = client.get("/api/status")
+        openclaw_status = client.get("/api/openclaw/status")
+        sessions = client.get("/api/openclaw/sessions")
+        session = client.get("/api/openclaw/sessions/main/session-1")
+        history = client.get("/api/openclaw/sessions/main/session-1/history", params={"limit": 5})
+        cron = client.get("/api/openclaw/cron")
+        approvals = client.get("/api/openclaw/approvals")
+
+    assert health.status_code == 200
+    assert health.json()["service"] == "openclaw-service"
+    assert status.status_code == 200
+    assert status.json()["status"] == "operational"
+    assert openclaw_status.status_code == 200
+    assert openclaw_status.json()["runtimeVersion"] == "2026.3.24"
+    assert sessions.status_code == 200
+    assert len(sessions.json()["sessions"]) == 2
+    assert session.status_code == 200
+    assert session.json()["session"]["agentId"] == "main"
+    assert history.status_code == 200
+    assert history.json()["limit"] == 5
+    assert cron.status_code == 200
+    assert cron.json()["jobs"][0]["id"] == "job-1"
+    assert approvals.status_code == 200
+    assert approvals.json()["approvals"][0]["id"] == "ap-1"
+
+
+def test_openclaw_service_session_404():
+    app = create_app()
+    app.dependency_overrides[openclaw_module.get_openclaw_cli_service] = (
+        lambda: _FakeOpenClawCliService()
+    )
+
+    with TestClient(app) as client:
+        response = client.get("/api/openclaw/sessions/missing")
+
+    assert response.status_code == 404