test(disputes): guard resolution during pause and maintenance

[brentthomas248]

Closes #1722

Summary:

• Add a focused Soroban regression proving resolve_dispute is rejected while the protocol is paused, in maintenance mode, and when both gates are active.
• Add the existing pause and maintenance write guards to resolve_dispute.
• Preserve read-only dispute detail access while writes are gated.
• Repair a storage-free profit invariant unit test so the PR branch runs the current CI test step cleanly.

Tests:

• cargo test -p quicklendx-contracts test_dispute_pause_maintenance -- --nocapture
• cargo test -p quicklendx-contracts profits::tests::test_investor_platform_treasury_sum_invariant -- --nocapture
• cargo test --verbose
• cargo clippy -p quicklendx-contracts --all-targets -- -D warnings
• git diff --check

Clean-clone patch check:

• git apply --check --unidiff-zero against a fresh QuickLendX/quicklendx-protocol clone passed locally.