Split API routes by domain with versioned namespacing

[smog123]

Closes #123

Refactor API routing into a versioned, domain-based structure to improve organization, scalability, and maintainability.

What Changed

• Added api/src/routes/v1/ for versioned API routes

• Split routes into domain-specific files:

  • lending.routes.ts
  • health.routes.ts
  • protocol.routes.ts

• Introduced centralized API router in api/src/routes/index.ts

• Updated api/src/app.ts to mount routes under /api/v1/*

• Removed legacy flat lending.routes.ts

Benefits

• Clear API versioning strategy
• Better route organization by domain
• Easier future expansion (v2, new domains, etc.)
• Improved maintainability and reduced routing complexity
• No changes to controllers, middleware, or business logic

Endpoint Structure

All routes now follow:

/api/v1/<domain>/<endpoint>

Examples:

• /api/v1/lending/prepare
• /api/v1/health/live
• /api/v1/protocol/stats

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