feat: endpoint basic examples add cache Increase interface speed

[jeevic]

this feature use a global variable cache example flows not every time read from db。

[codspeed-hq]

CodSpeed Performance Report

Merging #7124 will degrade performances by 11.53%

_{Comparing qifu-llm:feat_basic_examples_add_cache (ae16900) with main (858f2f3)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 17 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_build_flow_invalid_job_id	7.9 ms	8.9 ms	-11.53%
⚡	test_invalid_run_with_input_type_chat	18.1 ms	16.2 ms	+11.67%

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