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server: adopt lint block, fix clippy, fmt
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Format the tree with rustfmt and add the lint + supply-chain gates
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payments: seal webhook dedup and tip-split idempotency (audit Run 20 Phase 1)
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Store NULL, not "unknown", for PI-less transaction completions
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payments: close refund crash-window, seal enforcement_mode enum, license-key idempotency
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payments: idempotent re-runnable webhook finalize (ultra-fuzz Run 4 M-Pay1, A+)