Simplify API for v10: replace version workspaces with definition-based architecture

Remove @dicebear/api-5 through api-9 workspace packages and version routing layer.
Styles are now loaded from @dicebear/definitions via npm aliases, validated against
@dicebear/schema/options.json, and rendered with @dicebear/core's Avatar class.

- Add variant:weight query string parsing (e.g. eyesVariant=happy:3,wink:1)
- Compute query string limits dynamically from style definitions
- Use app.decorate for shared queryLimits (same pattern as fontLookup)
- Bump to Node 22+, @dicebear/core@10, @dicebear/converter@10

Author: FlorianKoerner

Dockerfile

@@ -9,7 +9,6 @@ EXPOSE 3000
 WORKDIR /app
 COPY --from=build /app/dist /app/dist
 COPY --from=build /app/fonts /app/fonts
-COPY versions /app/versions
 COPY LICENSE /app/LICENSE
 COPY package.json /app/package.json
 COPY package-lock.json /app/package-lock.json