chore: monorepo - plugin, backend und hilfsdaten in einem repo

- Eltern-Ordner ist jetzt EIN Git-Repo (statt getrennter Repos).
- root .gitignore haelt Secrets (.env), node_modules, DB und Build-Artefakte raus.
- release.ps1: manueller Release (ZIP bauen + ans Backend laden).
- root README mit Struktur und Release-Ablauf.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

license-backend/docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+  license-backend:
+    build: .
+    image: license-backend:latest
+    container_name: license-backend
+    restart: unless-stopped
+    env_file: .env
+    environment:
+      - PORT=8080
+      - DATA_DIR=/data
+    # No public port mapping: Nginx Proxy Manager reaches the container over the
+    # shared Docker network as "license-backend:8080". (For a quick local test
+    # without NPM, uncomment the ports block below.)
+    # ports:
+    #   - "127.0.0.1:8080:8080"
+    expose:
+      - "8080"
+    volumes:
+      # Named volume → data (SQLite DB) survives container recreation/redeploy.
+      - license-data:/data
+    networks:
+      - npm
+
+networks:
+  # The network Nginx Proxy Manager already runs on. Find it with:
+  #   docker network ls
+  # then set NPM_NETWORK in .env (e.g. NPM_NETWORK=npm_default).
+  npm:
+    external: true
+    name: ${NPM_NETWORK:-npm_default}
+
+volumes:
+  license-data: