Add --timeout flag to configure API request timeout

[fuleinist]

Problem

The CLI uses a hardcoded 30-second timeout for all API requests (defined in api.py as DEFAULT_TIMEOUT = 30.0). Users on slow connections or processing large documents may need more time.

Solution

Add a global --timeout flag to override the default timeout:

jina read https://large-pdf-url.com --timeout 60
jina search "complex query" --timeout 45

Use Case

Users with slow network connections or when fetching large documents (PDFs, long web pages) that take longer than 30 seconds to process.