⚡ Bolt: Use CSafeLoader for faster YAML parsing

[aafre]

What

Replaced pure-Python yaml.safe_load() calls in app.py with yaml.load(..., Loader=SafeLoader) using the C-based CSafeLoader when available.

Why

yaml.safe_load is written in pure Python and is notoriously slow for large or frequently accessed YAML files. The codebase frequently loads YAML (e.g., templates, incoming resume data). Using the C-extension loader drastically reduces parsing time.

Impact

Reduces YAML parsing time by ~90% (~10x speedup). Benchmarked using test_backward_compat.yml: yaml.safe_load took 0.220s for 100 iterations, while CSafeLoader took 0.024s.

Measurement

Verified via local benchmark and the backend Python test suite.

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PR created automatically by Jules for task 9830015024385020796 started by @aafre

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[gemini-code-assist]

Code Review

This pull request optimizes YAML parsing performance by introducing the C-based CSafeLoader (when available) across several functions, including load_resume_data and generate_resume. It also includes a significant reorganization of imports in app.py to improve consistency and readability. I have no feedback to provide.

[aafre]

Closing duplicate — the most recent version of this change is PR #549.

[google-labs-jules]

Closing duplicate — the most recent version of this change is PR #549.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.