[codex] fix(ci): initialize DingTalk request before debug logging

[eetoc]

Summary

• Move the DingTalk LLM request debug output after request_body is initialized.
• Prevent the release notification workflow from exiting under set -u before the LLM request is sent.

The failure was introduced when ${#request_body} was logged before the variable assignment, producing request_body: unbound variable.

Testing

• Extracted the embedded workflow Bash and validated it with bash -n.
• Ran the complete embedded script locally with mocked GitHub release, LLM, and DingTalk responses.
• Ran git diff --check.

Checklist

• Documentation updated when behavior or configuration changed (not applicable; no documented behavior changed).
• Tests added or updated for user-visible behavior (no repository test added; validated with a local mocked workflow smoke test).
• No secrets, private endpoints, internal certificates, or local runtime state included.

[monkeyscan]

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