feat: support DOCX uploads via Gotenberg (#2801)

Uploaded .docx files are converted to PDF on the server using a
Gotenberg
sidecar before entering the normal envelope pipeline. The feature is
opt-in via NEXT_PRIVATE_DOCUMENT_CONVERSION_URL; when unset, only PDF
uploads are accepted.

A per-process circuit breaker opens for 30s after a conversion failure
to shed load.

Ships a dev Dockerfile that layers Microsoft Core Fonts and additional
language fonts
onto the upstream Gotenberg image for better fidelity.

Co-authored-by: Ephraim Duncan
<55143799+ephraimduncan@users.noreply.github.com>

Co-authored-by: Ephraim Duncan <55143799+ephraimduncan@users.noreply.github.com>

packages/trpc/server/embedding-router/create-embedding-envelope.ts

@@ -37,5 +37,6 @@ export const createEmbeddingEnvelopeRoute = procedure
         bypassDefaultRecipients: true,
       },
       apiRequestMetadata: ctx.metadata,
+      logger: ctx.logger,
     });
   });