Create routes API endpoint

[3nd3r1]

Create REST API endpoint for route queries that fetches HSL routes and prepares them for AI enhancement.

Technical Details:

• Create app/api/v1/endpoints/routes.py
• Implement POST /api/v1/routes/search endpoint
• Accept origin/destination (coordinates)
• Call HSL service that was implemented to fetch routes
• Return routes in standardized format
• Add request validation with Pydantic schemas

Acceptance Criteria:

• POST /api/v1/routes/search endpoint works
• Accepts origin and destination parameters
• Returns list of routes with details
• Validates input data