* fix: handle empty strings in AI resource fields via serde deserializer
Add `empty_string_as_none` deserializer that converts empty strings to None
during deserialization. Applied to base_url, api_key, region, and AWS
credential fields in AIStandardResource and ProviderResource.
This fixes the "relative URL without a base" error when creating Anthropic
resources with empty base_url fields.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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* cleaning
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* fix: apply empty_string_as_none deserializer to api_key field
Consistent with other fields in ProviderResource, empty strings are now
deserialized as None for the api_key field.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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