refactor(engine): move click annotation from sharp to browser Canvas

The vision pipeline used sharp to draw a click marker on the scene image
server-side (engine/src/annotate.ts) and to render the MOCK_IMAGE
placeholder PNG (engine/src/mockImage.ts). Both moved off the runtime:

- annotateClick → apps/web/lib/annotateClient.ts (Canvas 2D in the
  browser; toDataURL → raw PNG base64 forwarded to /api/vision). Saves
  a server-side image re-fetch per click and frees the engine from
  sharp's native binding (which doesn't run on Cloudflare Workers).
- mockImageDataUri → self-describing SVG data URI (no rendering needed).

VisionRequest contract changes: prevImageUrl + click → annotatedImageBase64.
Server forwards the bytes straight to the vision LLM as image_url.

sharp is removed from packages/engine entirely and from next.config.ts's
serverExternalPackages. apps/web/package.json + lockfile cleanup ships
in the follow-up Cloudflare deployment commit.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/next.config.ts

@@ -10,7 +10,6 @@ const config: NextConfig = {
     "@infiplot/types",
     "@infiplot/tts-client",
   ],
-  serverExternalPackages: ["sharp"],
   turbopack: {
     root: path.join(__dirname, "..", ".."),
   },