feat: implement minimum donation amount enforcement#202
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- Add min_donation_amount: i128 field to CampaignData (0 = disabled) - Accept min_donation_amount in initialize() - Add Error::DonationTooSmall variant - Panic with Error::DonationTooSmall in donate() when amount < minimum Closes Dfunder#192
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Summary
Enforces a minimum donation amount on-chain to prevent dust donations.
Changes
min_donation_amount: i128toCampaignDatastructinitialize()now acceptsmin_donation_amountparameter (set to0to disable)Error::DonationTooSmallvariantdonate()panics withError::DonationTooSmallwhenamount < min_donation_amountCloses #192