feat: implement negative balance (mutual credit) system #441
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Allow wallets to go negative up to configurable limits per entity type, enabling a mutual credit model where users can temporarily operate "in the red" like a credit card. Default limit is -1000 credits.
Backend: Updated transaction, credit, and voucher services to validate against negative limits instead of zero balance. Frontend: Added warning banners in wallet when balance is negative, updated send button validation.
Also fixes bug where voucher quantity could go negative in marketplace.
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