fix(backend): remove @ts-nocheck from audit and student route modules

[Zinai10]

Closes #919

What changed

src/types/student.types.ts (new)

• Add Zod schemas: CreateStudentSchema, UpdateStudentSchema, StudentIdParamSchema
• Export inferred TypeScript types: CreateStudentBody, UpdateStudentBody, StudentIdParam
• Add StudentAuditDetails interface for typed audit detail payloads

src/utils/audit.ts

• Remove // @ts-nocheck suppression
• Replace as any cast with AuditDetailsRecord interface + Object.assign
• Narrow req.body via BodyWithOptionalEmail interface
• Narrow req.user via AuthenticatedUser interface
• Use nullish coalescing (??) consistently

src/routes/students.ts

• Remove // @ts-nocheck suppression
• Add typed Request<Params, ResBody, Body> generics on every handler
• Add parseBody() helper for centralised Zod validation with structured { field, message }[] error responses (400)
• Explicitly type the updateData object — no implicit any
• Replace all console.error calls with logger.error; include studentId context but never email (PII redaction)
• Handlers return Promise — no implicit any return type

tests/students.routes.test.ts (new, 19 tests)

• Success and error paths for GET /, GET /:id, POST /, PUT /:id, DELETE /:id
• Validation failure paths: missing fields, invalid email, invalid DID
• 500 paths assert structured logger is called with correct context
• PII-redaction assertion: email never appears in error log metadata
• DID sync and cache-invalidation side-effects verified

Verification

• tsc --noEmit: zero errors in target files
• 19 new tests pass; 2 pre-existing auditAction tests still pass

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[ayomideadeniran]

pr under review