fix: update API server paths in README to point to legacy directory

[pratik-naik003]

Problem

The README.md file contains instructions for starting the API servers under the Usage > Starting the API Server section. It currently instructs users to run:

python server/app.py
python server-https/app.py

However, the server/ and server-https/ directories have been moved inside the legacy/ folder. A new user following these instructions will encounter a FileNotFoundError as the files no longer exist at the root directory.

Proposed fix

Update the startup commands in the README to reflect the correct directory structure by prepending legacy/ to the paths:

# WebSocket API
python legacy/server/app.py

# HTTPS API
python legacy/server-https/app.py

Acceptance criteria

• The WebSocket API startup command in the README points to legacy/server/app.py.
• The HTTPS API startup command in the README points to legacy/server-https/app.py.
• The documented instructions can be executed successfully from the project root without path errors.