Oliver Hofmann c62cafc202 Store key_prefix for readable key display instead of masked hash
The last-4 of the SHA-256 hash was meaningless for identification.
Now storing the first 12 chars of the plaintext key as key_prefix,
displayed as 'sk-aBcDeFgH••••••••' — consistent with what the user
sees at creation time and how GitHub/OpenAI handle it.
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