* Support HTTP Basic auth for kosync connections
* fix(kosync): use separate password field for HTTP Basic auth
- Add `password?` field to KOSyncSettings to store the plain password
alongside the existing `userkey` (md5 hash), preserving backward
compatibility for existing users
- Replace Buffer.from() with btoa() for browser-compatible Base64 encoding
- Simplify buildHeaders() to use config fields directly instead of
the useAuth union type
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Huang Xin <chrox.huang@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Zach Bean