Fix: Add proper TypeScript path aliases for API imports

[Smartdevs17]

Problem

API imports use relative paths like ../../middleware/validation which are fragile and hard to read.

Context

Path aliases improve code readability and make refactoring easier.

Proposed Solution

Configure TypeScript path aliases:

// tsconfig.json
{
  "compilerOptions": {
    "paths": {
      "@/*": ["./src/*"]
    }
  }
}

Then use: import { validateDeposit } from '@/middleware/validation'

Acceptance Criteria

• Path aliases configured in tsconfig.json
• Existing imports updated to use aliases
• Jest configured to resolve aliases
• Build still works

Technical Notes

• Files: api/tsconfig.json, api/jest.config.js, all source files

Constraints

• Must work with both tsc and ts-jest

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