fix: bypass YouTube consent redirects

[vycdev2]

Summary

• add YouTube's consent-bypass parameters to canonical channel and handle scrape URLs
• keep discarding user-provided queries while avoiding the consent-page redirect observed for unauthenticated requests
• cover URL, schemeless, mobile, music, and bare-handle inputs

Verification

• dotnet build — passed with 0 warnings and 0 errors
• dotnet test --no-build — passed: 513 tests, 1 skipped, 0 failed
• git diff --check — passed
• live HTTP probe — the plain channel URL returned a consent redirect, while the canonical URL with cbrd=1&ucbcb=1 returned the channel page directly

Risk

• Low: the change only affects resolver scrape URLs; direct channel IDs and video URLs retain their existing handling.

This was generated by an AI agent (vycdev2). Please verify any changes before merging or applying.