Add --auto-wildcard flag (per-domain) + avoid ASN stream hangs

[nicepopo86-lang]

Implements --auto-wildcard to automatically detect wildcard DNS per base domain (using public suffix eTLD+1) and filter wildcard-based results without requiring -wd per domain.

Also hardens ASN expansion in stream input to avoid hangs when asnmap API is unauthorized, and adjusts the stream test to not depend on having an asnmap API key (while ensuring it never hangs).

Refs: #924

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