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

pyproject.toml

@@ -60,6 +60,7 @@ docker-sandbox = [
 ]
 dev = [
     "pytest>=8.3.3",
+    "pytest-asyncio>=0.24.0",
     "ruff>=0.6.9",
     "black>=25.0.0"
 ]
@@ -70,9 +71,6 @@ Repository = "https://github.com/agentscope-ai/agentscope-samples/evotraders"
 Documentation = "https://github.com/agentscope-ai/agentscope-samples/evotraders/README.md"
 "Bug Tracker" = "https://github.com/agentscope-ai/agentscope-samples/issues"
 
-[project.scripts]
-evotraders = "backend.cli:app"
-
 [tool.setuptools.packages.find]
 include = ["backend*", "shared*"]