[Backend] Add status and date-range filters to getBorrowerLoans

[ogazboiz]

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Why this matters

loanController.getBorrowerLoans returns paginated borrower loans, but only filters by borrower. Borrowers with longer histories want filtering by status (active, repaid, defaulted, liquidated, pending) and a date range. Without these, the loan list page is hard to use after even a few months of activity.

Acceptance criteria

• Add status and from/to query params, validated with Zod.
• Apply parameterised SQL filters and ensure the (borrower, status, created_at) index is present (file migration if not).
• Update the cursor pagination to remain stable under filters.
• Add Jest tests for 3 filter combinations including empty result.
• Update the @swagger JSDoc.

Files to touch

• backend/src/controllers/loanController.ts
• backend/src/schemas/loanSchemas.ts
• backend/src/routes/loanRoutes.ts
• backend/migrations/ (only if a new index is needed)
• backend/src/__tests__/loanEndpoints.test.ts

Out of scope

• Adding the same filters to the admin endpoints.
• Wiring the filter UI in the frontend (separate frontend issue).

[Akanimoh12]

@Akanimoh12 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I'd love to work on this issue. I'm a full-stack blockchain developer specializing in web apps and Smart Contracts, with experience in Next.js, TypeScript, Tailwind, and blockchain integration's and writing tests. I can handle this confidently, here's my portfolio and key projects:

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