fix(storage): correct signedUrl type to allow null in createSignedUrls

[mandarini]

The createSignedUrls return type declared signedUrl as string, but when a requested path does not exist the Storage server returns signedURL: null for that item and the client maps it to null in the ternary. This corrects the type to string | null so consumers can handle the partial-failure case without a type assertion. The mismatch was not caught by the compiler because the internal post() helper returns Promise<any>.

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commit: d30e01d