feat(sandbox): support injection match conditions

[miclle]

Summary

• add Python-friendly alias normalization for sandbox injection match fields (ifHeaders / ifQueries -> if_headers / if_queries)
• update the sandbox injection rule example to demonstrate base_url, if_headers, and if_queries
• handle envd command end events that report status: "exit status N" instead of exitCode

Validation

• pytest tests/cases/test_services/test_sandbox (120 passed, 3 skipped)
• python examples/sandbox_injection_rules.py (create/get/update/delete succeeded against the configured sandbox endpoint)

[gemini-code-assist]

Code Review

This pull request introduces support for if_headers and if_queries condition matching fields in Sandbox injection rules, along with camelCase compatibility. It also enhances command exit code parsing to handle snake_case keys and status strings. Additionally, test coverage is improved by isolating environment variables, verifying parameter normalization, and handling unsupported runtime errors in integration tests. No review comments were provided, and the implementation is clean and well-tested.

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[fennoai]

No issues found in this review. I reviewed the PR diff across code quality, performance, security, and documentation accuracy.

Verification: git diff --check origin/master...HEAD passed. Targeted pytest could not be run because pytest is not installed in this environment.