Fix Traefik POST / to echo request body (#54)

[SAILESH4406]

Description

This PR fixes the Traefik server implementation to correctly echo the request body when handling POST / requests.

Previously, the server was only handling the /echo route and returning request headers, without reading or returning the request body. This did not meet the expected behavior described in issue #54.

Changes Made

• Updated route handler to listen on / instead of /echo
• Restricted handler to POST method
• Implemented request body reading using io.ReadAll
• Ensured response returns the same body content
• Added proper HTTP status handling (405 for non-POST methods)

Expected Behavior

When sending: POST

With a request body, the server now:

• Returns 200 OK
• Echoes the exact request body content in the response

Checklist

• POST / correctly echoes request body
• Non-POST methods return 405 Method Not Allowed
• No unrelated files modified
• Implementation matches issue requirements

Closes #54