fix(contract): emit audit events from admin and configuration setters (#1635)

[zakarimaureen1-blip]

Title

Description

What changed

• Added contract event emissions for admin/configuration setters (set_per_user_cap, set_dao_threshold, set_emergency_approvers, set_emergency_dispute_window, configure_korean_strategy, set_relayer, set_gasless_relayer) to report previous and updated values.
• Integrated audit event emissions into invest, divest, and strategy whitelist modification paths.
• Documented event schemas across audit definitions.
• Added comprehensive unit tests in vault/src/event_tests.rs asserting event emissions for each configuration setter.

Why

Security-critical state transitions and asset allocations were occurring silently on-chain without event emissions. This prevented indexers, security tools, and auditors from tracking parameter modifications and protocol balance shifts.

How tested

• Executed cargo test -p vault to confirm all contract tests and event assertions pass.
• Verified test coverage in event_tests.rs for each newly emitted audit event.

Closes

Closes #1635

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