feat(storage): exhaustive DataKey, typed accessors, TTL helpers, clai…

[deborahamoni0-prog]

…m+vote impl

• storage.rs: full DataKey enum covering Admin, Token, Paused, ClaimCounter, Voters (instance) and PolicyCounter, Policy, Claim, Vote (persistent); typed read/write helpers are the only path to env.storage(); TTL bump on every persistent write (~1 yr / 6M ledgers); ASCII keyspace diagram for auditors and indexer team
• claim.rs: file_claim + vote_on_claim implemented exclusively through storage helpers; #[contractevent] for ClaimFiled, VoteLogged, ClaimProcessed; majority-vote tally with immediate payout on approve
• lib.rs: expose file_claim, vote_on_claim, is_paused, get_voters entrypoints; storage module made pub for test-only as_contract seeding
• tests/storage.rs: 16 integration tests covering all keyspace tiers, full approve/reject vote flows, duplicate-vote guard, non-voter guard, and counter immutability on pure-read paths; all seeding via storage helpers only — no raw DataKey construction in domain modules

Closes #3

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