Fix #133: Add root route to fix 404 error on backend root URL

[ChinmayShringi]

Problem

When accessing the backend at 0.0.0.0:5001, users receive a 404 error. This is confusing because the server appears to start successfully but the root URL returns nothing.

Solution

Added a root route (/) that returns:

• Service name and status
• Available endpoints information
• API route prefixes

Changes

• Modified backend/app/__init__.py to add an @app.route('/') endpoint

Testing

The root endpoint now returns:

{
  "service": "MiroFish Backend",
  "status": "running",
  "version": "1.0.0",
  "endpoints": {
    "health": "/health",
    "api": {
      "graph": "/api/graph",
      "simulation": "/api/simulation",
      "report": "/api/report"
    }
  }
}

Fixes #133

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Original PR: 666ghj/MiroFish#188
Original Author: @hkc5