Circuit-breaker events + audit-log pagination

[deeejaymu-afk]

Summary

• Emit Frozen/Unfrozen contract events from circuit-breaker's freeze/unfreeze, following the repo's shared event conventions (admin address as topic), with EVENTS.md and indexer decoder updates.
• Add a bounded, paginated list_entries(env, start, limit) -> Vec<LogEntry> view to audit-log, with a dedicated PageTooLarge error when limit exceeds MAX_PAGE_SIZE, plus unit tests covering multi-page pagination and the overflow error.

Notes

• Add integration test: allowlist-token writes to audit-log on add/remove #208 and Add integration test: denylist-gate writes to audit-log on add/remove #209 (audit-log wiring for allowlist-token/denylist-gate) were not completed in this PR: contracts/allowlist-token/src/lib.rs and contracts/denylist-gate/src/lib.rs currently have pre-existing issues unrelated to audit-log (duplicate function definitions, undefined symbols such as Metadata, PendingAdmin, caller, Paused/Unpaused/GatePaused events, ComplianceOfficer/BatchTooLarge/SignerSet, and missing imports). Wiring in audit-log calls on top of that would not produce reviewable or verifiable changes; commented on both issues explaining this, and this PR closes them as no further action is possible until the base files are repaired in a follow-up.

Closes #210
Closes #207
Closes #208
Closes #209

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