chore: prepare the repository for public release

[Yaminyam]

Cleanup ahead of making this repository public (BA-6864). Nothing here changes plugin behaviour on the request path — it removes dead template cruft, fixes broken Makefile paths, adds the missing license, and drops a stray debug print.

Why now

The core installer currently fetches this plugin's release tarball and, because this repo is private, has to fall back to gh release download. That fallback does not work for external users, which blocks the traefik frontend rollout. Making the repo public removes that fragility — so let's make sure it is presentable first.

Changes

Add LICENSE (LGPL-3.0) — the repo had none. Matches lablup/backend.ai.

Remove docker-compose.yml — it is pure leftover from the upstream template this repo was bootstrapped from, and has never worked here:

• declares the plugin under the unrelated third-party module path github.com/nihaopaul/traefik-rust-wasm-plugin
• mounts pkg/traefik-auth.wasm, a file the build never produces (make release emits pkg/backend.ai/appproxy-traefik-plugin/plugin.wasm)
• configures the middleware with cf_token / cf_org / cf_domain, none of which this plugin accepts — it takes circuit, jwt_secret, permit_hash_secret, permit_cookie_name

Rather than invent an untested dev harness, it is removed. Happy to add a real one in a follow-up if it is wanted.

Makefile — drop the targets that only existed to drive that compose file (docker; and http, which curled the deleted whoami /foo route), and fix two broken paths:

• debug pointed at the nonexistent pkg/traefik-auth.wasm → now the real artifact
• cargo pointed at a nonexistent libs/ directory → now traefik_wasm_api/

go/plugin.go — remove a leftover debug print that dumped the whole plugin config to stderr on every middleware instantiation (once per circuit):

os.Stderr.WriteString(fmt.Sprintf("########## New, config: %+v $$$$$$$$$$\n", config))

Verification

• go vet ./... and go build ./... pass
• cargo build --target wasm32-wasip1 --release succeeds
• make release still emits exactly the layout traefik loads from plugins-local/src/:

  backend.ai/appproxy-traefik-plugin/{plugin.wasm,.traefik.yml}
  backend.ai/appproxy-traefik-plugin-go/{plugin.go,go.mod,go.sum,.traefik.yml}
  

  which matches what is deployed today.

Pre-public audit (for the reviewer)

I scanned the full git history before proposing this:

• no hardcoded secrets (only doc placeholders like "base64-encoded-secret")
• no internal hostnames / infrastructure references

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