update: server startup logic to use next available port

[manikanta5827]

Feature: Auto Port Selection

Fixes #1642

JSON Server now automatically finds the next available port if the specified port is already in use.

Problem

When starting the server with npm run dev or tsx src/bin.ts db.json, if port 3000 is busy, the server would fail to start.

Solution

Added automatic port retry logic that increments the port number until an available port is found.

Example

# If port 3000 is busy, server automatically tries 3001, 3002, etc.
npm run dev
# Output: JSON Server started on PORT :3001

Technical Details

• Modified startServer() function to retry with port+1 on EADDRINUSE error
• Updated logRoutes() to use the actual running port instead of original port

[manikanta5827]

[manikanta5827]

should i display this to user before switching to new port

Port 3000 is in use. Would you like to run the app on another port instead? (Y/n)