fix: AI system messages should always be at start of prompt

[YousefED]

Anthropic / Gemini would give an error "Multiple system messages that are separated by user/assistant messages' functionality not supported" when alternating between system and user messages

[vercel]

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Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Jun 10, 2025 2:24pm
blocknote-website	✅ Ready (Inspect)	Visit Preview	Jun 10, 2025 2:24pm

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commit: 8610321