Migrate from Yarn 1 to pnpm (#10465)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Eric Bailey <git@esb.lol>

Dockerfile.embedr

@@ -29,11 +29,11 @@ RUN mkdir --parents $NVM_DIR && \
 RUN \. "$NVM_DIR/nvm.sh" && \
   nvm install $NODE_VERSION && \
   nvm use $NODE_VERSION && \
-  npm install --global yarn && \
-  yarn && \
+  npm install --global pnpm@11.1.1 yarn && \
+  pnpm install --frozen-lockfile && \
   cd bskyembed && yarn install --frozen-lockfile && cd .. && \
-  yarn intl:build && \
-  yarn build-embed
+  pnpm intl:build && \
+  pnpm build-embed
 
 # DEBUG
 RUN find ./bskyweb/embedr-static && find ./bskyweb/embedr-templates && find ./bskyembed/dist