Add zk-nullifier example and reorganize zk/ folder#28

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tilo-14 wants to merge 5 commits intomainfrom

feat/add-nullifier

Commits on Jan 13, 2026

feat: add ZK examples (zk-id, zk-nullifier, zk-merkle-proof)
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refactor(zk): Remove unused deps and fix circuit imports
tilo-14
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refactor(zk-nullifier): Rename verifying keys to match light-protocol pattern
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fix(circuits): Fix CI compilation errors and address PR feedback
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refactor(circuits): Reorganize nullifier circuits following circomlib pattern
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