feat(backend-js): add a Node.js implementation of the Quickstart backend#1

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Commits on Apr 29, 2026

build: add BACKEND selector with dual-backend Make/Compose/Docker plumbing

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feat(backend-js): bootstrap Fastify server with config and tooling

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feat(backend-js): auth subsystem with OAuth2, shared-secret, and tenants

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feat(backend-js): PQS database layer and licensing repository

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feat(backend-js): Canton JSON Ledger API client with typed Daml command bindings

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feat(backend-js): licensing service and HTTP routes

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docs: document the Node.js backend in the README

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fix: distinguish 404 from 500 on DELETE /admin/tenant-registrations
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