feat: set default HTTP request timeout to 150 seconds

[Copilot]

This PR updates the default timeout for all HTTP requests from the previous conditional values (60s for GET, 120s for other methods) to a consistent 150 seconds across all HTTP methods.

Changes Made

Modified ddns/util/http.py:

• Updated line 122 to use timeout=150 for all HTTP requests instead of the previous conditional logic
• Ensures consistent timeout behavior regardless of HTTP method

Added test coverage in tests/test_util_http.py:

• Added TestHttpRequestTimeout class with comprehensive test to verify the 150-second timeout
• Tests both GET and POST requests to ensure consistent behavior
• Uses proper mocking to capture and validate the timeout parameter

Impact

• Consistent behavior: All HTTP methods (GET, POST, PUT, etc.) now use the same 150-second timeout
• Improved reliability: Longer timeout reduces the chance of premature timeouts for slow DNS provider APIs
• No breaking changes: All existing functionality continues to work correctly
• Well-tested: New test ensures the timeout is properly applied

Testing

• All 785 existing tests continue to pass
• New timeout-specific test validates the 150-second timeout for both GET and POST requests
• Manual verification confirms the timeout parameter is correctly set

Fixes #554.

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