Capture bounded Provider HTTP body evidence

[LioRael]

What changed

• capture Provider HTTP request and response JSON bodies before persistence
• recursively redact sensitive fields and omit bodies above the 64 KiB evidence limit
• persist explicit captured, not-applicable, and not-captured states with reasons and observed sizes
• keep body content out of compact Story metadata while exposing coverage summaries
• document the evidence policy and cover migration/persistence behavior with PostgreSQL tests

Why

Story Inspector could explain Provider calls but the runtime never retained safe request or response body evidence. Console therefore had no source-owned body content to display.

Validation

• cargo fmt --all -- --check
• cargo test -p lenso-platform-core -p lenso-platform-provider --all-targets --locked
• cargo clippy -p lenso-platform-core -p lenso-platform-provider --all-targets --locked
• real PostgreSQL provider-call persistence test
• real PostgreSQL platform migration test
• git diff --check

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