feat: add ai detection for recipients and fields (#2271)

Use Gemini to handle detection of recipients and fields within
documents.

Opt in using organisation or team settings.

Replaces #2128 since the branch was cursed and would include
dependencies that weren't even in the lock file.



https://github.com/user-attachments/assets/e6cbb58f-62b9-4079-a9ae-7af5c4f2e4ec

packages/lib/server-only/ai/index.ts

@@ -0,0 +1 @@
+export * from 'ai';