fix: Improve request count tracking by using fresh contexts

[sanbotto]

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability of request metrics collection for proxy endpoints by ensuring metrics are recorded independently of request lifecycle conditions.

[coderabbitai]

Walkthrough

The server code was modified to use a fresh background context with a 5-second timeout instead of the original request context when incrementing per-endpoint proxy request counts. This change applies to both HTTP and WebSocket success paths. The new implementation creates a metrics context (metricsCtx), invokes IncrementRequestCount with it, handles any resulting errors, and then cancels the context. Minor formatting updates and explanatory comments were also added. No changes were made to exported or public entity signatures.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: improving request count tracking by using fresh contexts instead of original request contexts for metric increments.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/fresh-context-for-request-count

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