fix: sync native browser site contracts

[DarinRowe]

Summary

• synchronize the native-host browser site registry with the extension generated-image contracts
• accept regional and global Qwen URLs while preserving exact source validation
• cover current ChatGPT, Claude, Grok Imagine, Perplexity, AI Studio, Qwen, and Doubao paths/assets

Verification

• bun run typecheck
• bun run test — 199 passed
• bun run check:release-note
• source rb extension install-host and verify-host
• authenticated ego capture: chat.qwen.ai recovered from native rejection to imported

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