Support sponsored Umbra fee payer secrets#325
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Adds backend support for sponsored Umbra fee payer secrets so private passkey payments can use a server fee payer without requiring SOL on the passkey wallet.\n\nChanges:\n- accepts base58 64-byte secret strings for Umbra fee_payer\n- adds neutral fee_payer_secret input to avoid Flow wallet materialization converting fee_payer to pubkey\n- prefers fee_payer_secret when present\n- adds focused tests for sponsored fee payer parsing and rewrite behavior\n\nVerified:\n- bun test ./crates/cmds-bun/src/umbra/umbra_common.ts