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_market_service.py

@@ -115,7 +115,7 @@ class TestPollingPriceManager:
                 {"c": 100.0, "o": 99.0, "h": 101.0, "l": 98.0, "pc": 99.5, "d": 0.5, "dp": 0.5, "t": 1},
             ],
         ):
-            with caplog.at_level(logging.INFO):
+            with caplog.at_level(logging.INFO, logger="backend.data.polling_price_manager"):
                 manager._fetch_prices()
                 manager._fetch_prices()