Pass cid/seq_id as structured meta instead of as a value in the errors

[chrisboulton]

There's probably a few others that we should consider doing the same for, but unknown seq_id is the bulk of the unnormalised noise we see.

Summary by CodeRabbit

• Refactor
  • Improved diagnostic logging for unmatched sequence IDs and callback identifiers using structured fields.
  • No user-facing behavior changes.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 18a912e1-3fb7-413f-a128-8e52e08f3948

📥 Commits

Reviewing files that changed from the base of the PR and between 977521b and 5e08248.

📒 Files selected for processing (1)

• src/client/mod.rs

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📝 Walkthrough

Walkthrough

Client error logs now emit seq_id and cid as structured tracing fields instead of interpolating them into message strings.

Changes

Structured tracing updates

Layer / File(s)	Summary
Client error log fields src/client/mod.rs	The forward_to_seq and on_seq_opened error logs record seq_id and cid through structured tracing fields.

Estimated code review effort: 1 (Trivial) | ~2 minutes

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