Fix: Add protocol to Document Intelligence endpoints if missing

[Copilot]

Issue

When using Document Intelligence with PDF files in workspaces, users encounter the error:

No connection adapters were found for '/formrecognizer/documentModels/prebuilt-read:analyze?stringIndexType=unicodeCodePoint&api-version=2023-07-31'

The error occurs because the Azure Document Intelligence endpoint in the settings doesn't have the required protocol prefix (https://), causing the API client to treat the endpoint as a relative path instead of a complete URL.

Solution

This PR adds validation to ensure both Document Intelligence endpoints (direct and APIM) always have the proper URL format with protocol:

# Ensure the endpoint has a protocol prefix
if form_recognizer_endpoint and not (form_recognizer_endpoint.startswith('http://') or form_recognizer_endpoint.startswith('https://')):
    form_recognizer_endpoint = 'https://' + form_recognizer_endpoint

The same logic is applied to the APIM endpoint.

Testing

Verified the fix with multiple test cases:

• Endpoint without protocol -> correctly adds 'https://'
• Endpoint with 'http://' -> keeps it unchanged
• Endpoint with 'https://' -> keeps it unchanged
• Empty or None endpoint -> handles gracefully, no changes

Fixes #249.

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