Notify admins on loan dispute via email and SSE

[davidmaronio]

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Description

When a borrower contests a default (POST /loans/:id/dispute), the code logs the event but skips admin notification. Disputes require prompt review; the TODO at line 118 of loanController.ts has been open across multiple pulls.

What Needs to Happen

• Send email to ADMIN_EMAIL (env var) using the existing notification service
• Push SSE notification to all active admin SSE subscribers
• Optionally POST to ADMIN_WEBHOOK_URL if configured (Discord/Slack-compatible)
• Add ADMIN_EMAIL and optional ADMIN_WEBHOOK_URL to .env.example

Files

• backend/src/controllers/loanController.ts (line 118)

Acceptance Criteria

• Admin email sent on new dispute
• Admin SSE subscribers receive real-time push
• Degrades gracefully when ADMIN_EMAIL is not set