feat(auth): auto-upgrade every legacy password format to bcrypt on login

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checkLogin now verifies and migrates all known password formats without
configuration: bcrypt, argon2id/argon2i/argon2d, unsalted md5/sha1/sha256/
sha512, double-md5 (UberCMS/Butterfly), salted md5 with embedded salt
(hash:salt, salt:hash, hash$salt), and a guarded plaintext fallback.

Every successful legacy login rewrites the stored hash to bcrypt, so the
CONVERT_PASSWORDS flag is no longer required (kept for deploy compatibility).

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openhands committed 2026-09-17 14:56:31 +02:00

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commit e153300da0

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src/lib/auth/password.test.ts

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