fix web types

[NikhilShahi]

Note

Low Risk
Low risk: changes are limited to Pydantic model type annotations for metadata fields plus a package version bump, with no behavioral logic changes.

Overview
Broadens the metadata field type across crawl/scrape/fetch response models from a restricted str | list[str] union to Any, aligning SDK types with more flexible API payloads.

Bumps the package version to 0.90.0.

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