unify integration banks depsit/withdraw instructions

[IMEF-FEMI]

Summary

This PR consolidates all wrapped-integration user deposit and withdraw flows behind a single interface: integration_deposit and integration_withdraw. Instead of maintaining separate entrypoints for Kamino, Drift, Solend, and JupLend, marginfi now shares one common validation, accounting, rate-limit, health-check, and event pipeline, while keeping only the protocol-specific CPI logic isolated in per-integration handlers.

Motivation

The previous pattern duplicated the most security-sensitive parts of the flow across multiple integrations. Authorization, paused-state handling, deleverage accounting, rate-limiter enforcement, health validation, cache updates, and event emission were all copied per-protocol. Every change had to be replicated across nearly-identical handlers, raising the odds of inconsistent fixes and integration-specific gaps.

Changes

• Shared pipeline — Common pre-deposit validation, post-deposit finalization, and post-withdraw finalization (health check, rate limiting, deleverage tracking, event emission) now live in integration_common.rs and integration/mod.rs
• Protocol handlers — Each integration (kamino_handler, drift_handler, solend_handler, juplend_handler) contains only its CPI construction, account validation, and balance computation
• Protocol accounts via remaining_accounts — The unified IntegrationDeposit/IntegrationWithdraw Anchor structs hold common accounts; protocol-specific accounts are passed and split by withdraw_protocol_account_count
• TS test utilities — All instruction builders now target integrationDeposit/integrationWithdraw with protocol accounts packed as remaining accounts, validated at build time against INTEGRATION_PROTOCOL_ACCOUNT_COUNTS

Advantages

• Protocol-specific code is narrower and easier to audit
• Future integrations only need a new handler — no new entrypoint or duplicated pipeline
• Clients get one deposit path and one withdraw path with a clear separation between marginfi behavior and protocol account packing