Bring Remix v3 to server-first parity

[swernerx]

Summary

Refs #353.

This brings the Remix v3 integration to the server-first parity path described in the epic:

• loads checked-in .po catalogs through @palamedes/remix/register and adds sync config loading for the Node loader path
• adds @palamedes/remix/server helpers for locale resolution, request-local i18n, catalog message caching, cookie serialization, and fetch-router middleware
• expands Remix examples to cookie, route, subdomain, and TLD strategies with checked-in catalogs and smoke coverage
• documents the supported server-first setup, tested Remix beta, unsupported browser/client and rich JSX paths, migration notes, and beta tracking
• adds a non-blocking remix@next canary smoke job

Follow-ups

• Remix asset pipeline transform hook: Add an asset pipeline hook for script transforms remix-run/remix#11580
• Remix UI adapter, rich messages, and Frames: Track Remix v3 UI adapter, rich messages, and Frames #357

Verification

• pnpm check:release-set
• pnpm format:check
• pnpm lint:oxlint
• pnpm build
• pnpm check-types
• pnpm test
• pnpm verify:examples:smoke -- --framework remix

[swernerx]

Read through this against #353 — Slice A and B land cleanly, the streamed-body scope binding answers Spike 2 with a real test, and the support matrix is honest about the client boundary. A few notes on the lines below; none of them block.