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Update API with cross-layer support (layer=all)

Add rsID search support to variant endpoint

Precompute summary stats at startup for instant /summary

Add num_var to gene summary from permutation results

Precomputed gene summary tables for fast /genes endpoint

Add layer_key, pval_beta, fdr fields; layer selector support

Fix gene search to match both symbol and Ensembl ID

Update API for multi-omics dev subsets + rsID lookup

Upload main.py with huggingface_hub