Implement batch mode endpoint

[wklumpen]

Description

Create POST endpoint to run complete simulation in batch mode.

Tasks

• Create POST /api/simulation/run endpoint
• Accept JSON config in request body (components, routes, tours, trains)
• Validate config against schema
• Create session and call run_to_completion()
• Return results in response
• Handle validation errors (400)
• Handle simulation errors (500)

Acceptance Criteria

• Endpoint accepts valid config JSON
• Returns simulation results with status 200
• Proper error messages for invalid input
• Returns HTTP 400 for bad requests
• Returns HTTP 500 for simulation errors

Time Estimate

3 hours

Dependencies

• Depends on Implement session management #91 (Session management)
• Depends on Create Flask app factory #92 (Flask app)
• Depends on Define API schemas #93 (Schemas)

Files Changed

• spur/api/server.py

Testing

curl -X POST http://localhost:5000/api/simulation/run \
  -H "Content-Type: application/json" \
  -d @examples/api/example_config.json