Register the gnps backend via _proxies so the PROXI aggregator querie…

[rukubrakov]

…s GNPS alongside its default backends instead of only GNPS, and add a test asserting all backends are registered

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[github-actions]

🚀 Performance Benchmark Results (Python 3.11)

Comparing PR branch vs main branch

Benchmark	PR (ms)	Main (ms)	Δ (ms)	Change %	Rounds	Status
test_spectrum_creation_regular	0.040	0.038	+0.001	+3.3%	50	—
test_spectrum_creation_jit	0.032	0.032	+0.001	+1.7%	50	—
test_spectrum_creation_large_regular	0.193	0.191	+0.002	+0.9%	50	—
test_spectrum_creation_large_jit	0.185	0.183	+0.002	+1.3%	50	—
test_spectrum_round_regular	0.058	0.050	+0.008	+15.4%	5	⚠️ 15.4% slower
test_spectrum_round_jit	0.019	0.018	+0.000	+0.8%	34670	—
test_spectrum_filter_intensity_regular	0.026	0.025	+0.000	+1.8%	5	—
test_spectrum_filter_intensity_jit	0.021	0.021	+0.000	+0.5%	12306	—
test_spectrum_scale_intensity_regular	0.049	0.058	-0.009	-15.2%	5	✅ 15.2% faster
test_spectrum_scale_intensity_jit	0.013	0.013	-0.000	-0.1%	15958	—
test_creation_performance_comparison[100]	0.025	0.025	+0.000	+0.8%	50	—
test_creation_performance_comparison[1000]	0.038	0.038	-0.000	-0.9%	50	—
test_creation_performance_comparison[5000]	0.103	0.103	-0.000	-0.3%	50	—
test_creation_performance_comparison[10000]	0.190	0.191	-0.001	-0.8%	50	—
test_jit_creation_performance_comparison[100]	0.019	0.019	-0.000	-0.1%	50	—
test_jit_creation_performance_comparison[1000]	0.031	0.031	+0.000	+0.0%	50	—
test_jit_creation_performance_comparison[5000]	0.097	0.097	-0.000	-0.1%	50	—
test_jit_creation_performance_comparison[10000]	0.183	0.183	-0.000	-0.2%	50	—

Summary

• ✅ 1 improvement (>5% faster)
• ⚠️ 1 regression (>5% slower)
• 16 unchanged (within ±5%)

Changes smaller than ±5% are not considered significant.
Lower times are better.