fix: populate investor_projects via vault event polling

[Netty-kun]

Overview

This PR fixes the notification service being a no-op in production by adding a second event poller. When vault_contract_id is set, the poller reads the configured vault contract, decodes Deposit and ProjectFunded events, and calls store.recordInvestment to populate the investor_projects index. This ensures getInvestorsForProject returns recipients and notifyInvestors is actually invoked on investment activity.

Related Issue

Closes #

Changes

🔌 Vault Event Poller

• [MODIFY] notification-service/src/config.ts

  • vault_contract_id is now read from the environment and exposed on the config object.
  • Poller registration is conditional on this value being present.

• [MODIFY] notification-service/src/types.ts

  • Add Deposit and ProjectFunded decoded event payload types.
  • Add a VaultEvent union to safely handle both event kinds.

• [MODIFY] notification-service/src/listener.ts

  • Add pollVaultEvents, mirroring pollScoreChanges, that polls vault_contract_id, decodes matching vault events, and calls store.recordInvestment.

• [MODIFY] notification-service/src/index.ts

  • When config.vault_contract_id is set, start the vault poller alongside the existing score poller.

• [MODIFY] notification-service/src/listener.test.ts

  • Add integration coverage: vault events seeded only through the new poller result in a ScoreChanged event that reaches the investor.

Verification Results

npm test -- notification-service/src/listener.test.ts
✅ 1 passed (integration: vault events → investor_projects → ScoreChanged)

npm run build
✅ TypeScript compilation passes

Live acceptance check:
✅ vault_contract_id, when set, is used to poll and decode vault events
✅ Deposit/ProjectFunded events call store.recordInvestment
✅ investor_projects is populated and notifyInvestors receives recipients

Acceptance Criteria	Status
vault_contract_id, when set, is used to poll and decode vault events	✅ Poller registered when config value present
A decoded Deposit/ProjectFunded event results in a call to store.recordInvestment	✅ Integration test verifies recordInvestment is invoked
Integration test: seeding only via the new vault listener (not recordInvestment called directly) results in a ScoreChanged event correctly notifying that investor	✅ Test passes — no direct recordInvestment calls

Closes #337

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