feat(backend): index LendingPool, RemittanceNFT and MultisigGovernance events in event indexer

[Akpolo]

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Problem

The event indexer currently only tracks LoanManager events. LendingPool, RemittanceNFT, and MultisigGovernance contract events are never indexed. This means:

1. Dashboard pool stats are incomplete (deposits and withdrawals missing)
2. NFT score changes and seizure events are not queryable
3. Governance activity is invisible to the frontend

Expected Behavior

The indexer should subscribe to and store events from all four contracts:

• LendingPool: Deposit, Withdraw, EmergencyWithdraw
• RemittanceNFT: ScoreUpdated, NFTSeized, NFTBurned, NFTMinted
• MultisigGovernance: ProposalCreated, ProposalApproved, ProposalFinalized

Each event type should be stored in the appropriate database table with the relevant fields.

Location

backend/src/services/eventIndexer.ts (or equivalent indexer service)

Impact

Without this, dashboard pool utilization stats are wrong, borrower NFT history is not queryable, and governance transparency is broken.

[khanavi272-spec]

@khanavi272-spec has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I would like to work on this issue

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[Divine-mercyx]

@Divine-mercyx has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi, i would like to work on this issue

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[Damilola123-pan]

@Damilola123-pan has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would like to work on this specific issue because it's something I've worked on in the past before and would most certainly have a solution to

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[edehvictor]

@edehvictor has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Can I work on this

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