Add /health endpoint for monitoring authentication and download state

[Copilot]

Adds a health check endpoint to the Flask server that returns status based on whether the user is authenticated and download is active.

Implementation

• Endpoint: GET /health
  • Returns "ok" (HTTP 200) when Status.NO_INPUT_NEEDED - authenticated, download in progress
  • Returns "fail" (HTTP 503) for all other states - awaiting MFA/password or during auth verification

Changes

• src/icloudpd/server/__init__.py: Added health endpoint route handler
• tests/test_health_check.py: Test coverage for all status transitions

@app.route("/health", methods=["GET"])
def health() -> Response | str:
    _status = _status_exchange.get_status()
    if _status == Status.NO_INPUT_NEEDED:
        return make_response("ok", 200)
    else:
        return make_response("fail", 503)

The endpoint enables container orchestrators and monitoring systems to verify the service is operational and not blocked on user input.

Original prompt

add a health check endpoint, respond ok when user login succed and download started, respond fail when other

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