refactor(repo): replace legacy openflare-server with Wavelet rename

Delete the old monolithic openflare-server implementation and rename
Wavelet/ to openflare-server/ to complete the migration consolidation.
Update CI workflows, agent Dockerfiles, and deployment docs for the new
layout (frontend/, docker/Dockerfile).

.github/workflows/docker-server.yml

@@ -74,8 +74,8 @@ jobs:
         id: build
         uses: docker/build-push-action@v7
         with:
-          context: .
-          file: ./openflare-server/Dockerfile
+          context: ./openflare-server
+          file: ./docker/Dockerfile
           platforms: ${{ matrix.platform }}
           outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
           build-args: |