Improve generic D1 mirroring support

[stritt]

Summary

• add shared SQL utilities for identifier quoting, placeholder conversion, and Postgres value formatting to support arbitrary schemas
• patch prepared statement execution so every D1 write is mirrored with normalized parameters and placeholder conversion
• stream exports and generate migrations using discovered primary keys and quoted identifiers for any table shape

Testing

• npx tsc --noEmit

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https://chatgpt.com/codex/tasks/task_e_68cc85a26ea483249bedb4ba2eb0250f