Remove r402-facilitator crate and Docker infrastructure from workspace

* Remove r402-facilitator from workspace members and package dependencies
* Remove r402-facilitator from rust-publish workflow package list
* Delete Dockerfile and .dockerignore files
* Delete r402-facilitator crate directory including Cargo.toml, README.md, and all source files
* Remove unused workspace dependencies: tokio-util, axum, rustls, tower-http, dotenvy, opentelemetry ecosystem crates, and tracing-subscriber
* Keep

Author: gitctrlx

.dockerignore

@@ -12,6 +12,6 @@ jobs:
   call-publish:
     uses: qntx/workflows/.github/workflows/rust-publish.yml@main
     with:
-      package: "r402 r402-evm r402-svm r402-http r402-facilitator"
+      package: "r402 r402-evm r402-svm r402-http"
     secrets:
       CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}