Add API auth seamline and minimal Claude proxy

[Copilot]

What Changed

Creates a dedicated auth seamline under the API layer so auth HTTP flows are no longer embedded in wsServer. Adds a minimal Claude-compatible Anthropic proxy, modeled on claude-proxy, behind /api/auth.

• API seamline

  • Added apps/server/src/api/router.ts to centralize /api/* handling.
  • Moved auth-related HTTP routing out of the monolithic server request path.

• Auth router

  • Added apps/server/src/api/authRouter.ts.
  • Preserved the existing pairing flow at /api/pairing.
  • Added /api/auth/pairing as the auth-scoped route.

• Minimal Claude proxy

  • Added POST /api/auth/anthropic/v1/messages.
  • Forwards requests to Anthropic with:
    • anthropic-beta: claude-code-20250219
    • preserved x-api-key
    • preserved anthropic-version
    • Claude Code system prompt injected into system
  • Added /api/auth/anthropic/health and /api/auth/anthropic/status.

• Server wiring

  • Updated apps/server/src/wsServer.ts to delegate /api traffic through the new router instead of handling pairing inline.

• Coverage

  • Added focused router tests for pairing compatibility, Anthropic proxy envelope behavior, and API 404s.

const response = await fetch("/api/auth/anthropic/v1/messages", {
  method: "POST",
  headers: {
    "content-type": "application/json",
    "x-api-key": "...",
    "anthropic-version": "2023-06-01",
  },
  body: JSON.stringify({
    model: "claude-sonnet-4-20250514",
    messages: [{ role: "user", content: "Hello" }],
  }),
});

Why

The issue was not the proxy behavior itself; it was that auth and proxy concerns had no clean seam under the API layer. This change creates that seam first, then hangs a minimal Claude/Anthropic proxy off it so auth routing can evolve without growing more logic inside wsServer.

UI Changes

No UI changes.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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