refactor(cleanup): remove legacy CLI and complete EvoAgent migration cleanup

- Delete backend/cli.py and all CLI-specific tests (test_cli.py,
  test_openclaw_cli_service.py, test_skills_cli.py)
- Remove evotraders console script from pyproject.toml
- Update README/CLAUDE.md to reference python backend/main.py instead of CLI
- Add pytest-asyncio to dev dependencies
- Enhance EvoAgent with reload_runtime_assets and backward-compat attrs
- Align tests with updated API semantics and gateway process models

Constraint: CLI is deprecated in favor of split-service runtime model
Confidence: high
Scope-risk: moderate

backend/tests/test_openclaw_service_app.py

@@ -43,11 +43,49 @@ class _FakeOpenClawCliService:
             "items": [{"role": "assistant", "text": "hello"}],
         }
 
+    def status_model(self):
+        from shared.models.openclaw import OpenClawStatus
+        return OpenClawStatus(runtimeVersion="2026.3.24")
+
+    def get_session_model(self, session_key: str):
+        from shared.models.openclaw import SessionEntry
+        for session in self.list_sessions()["sessions"]:
+            if session["key"] == session_key:
+                return SessionEntry.model_validate(session, strict=False)
+        raise KeyError(session_key)
+
+    def list_sessions_model(self):
+        from shared.models.openclaw import SessionsList, SessionEntry
+        sessions = [
+            SessionEntry.model_validate(s, strict=False)
+            for s in self.list_sessions()["sessions"]
+        ]
+        return SessionsList(sessions=sessions)
+
+    def get_session_history_model(self, session_key: str, *, limit: int = 20):
+        from shared.models.openclaw import SessionHistory
+        raw = self.get_session_history(session_key, limit=limit)
+        return SessionHistory(
+            sessionKey=raw["sessionKey"],
+            session_id=None,
+            events=raw["items"],
+            history=raw["items"],
+            raw_text=None,
+        )
+
     def list_cron_jobs(self):
         return {"jobs": [{"id": "job-1", "name": "Daily sync"}]}
 
+    def list_cron_jobs_model(self):
+        from shared.models.openclaw import CronList
+        return CronList.from_raw(self.list_cron_jobs())
+
     def list_approvals(self):
-        return {"approvals": [{"id": "ap-1", "status": "pending"}]}
+        return {"approvals": [{"approvalId": "ap-1", "toolName": "test_tool", "status": "pending"}]}
+
+    def list_approvals_model(self):
+        from shared.models.openclaw import ApprovalsList
+        return ApprovalsList.from_raw(self.list_approvals())
 
 
 def test_openclaw_service_routes_are_exposed():
@@ -85,17 +123,17 @@ def test_openclaw_service_read_routes():
     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 openclaw_status.json()["runtime_version"] == "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 session.json()["session"]["agent_id"] == "main"
     assert history.status_code == 200
-    assert history.json()["limit"] == 5
+    assert len(history.json()["events"]) == 1
     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"
+    assert approvals.json()["approvals"][0]["approval_id"] == "ap-1"
 
 
 def test_openclaw_service_session_404():