feat: add adapted ERPNext v16 docker-compose for Coolify deployment

.env.example

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+MARIADB_ROOT_PASSWORD=
+ADMIN_PASSWORD=

README.md

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+# erpnext-deploy
+
+Docker Compose pentru Frappe/ERPNext v16.28.0, adaptat dupa `frappe_docker/pwd.yml` oficial pentru deployment persistent prin Coolify (nu doar trial):
+
+- `deploy.restart_policy` (ignorat de docker compose in mod non-swarm) inlocuit cu `restart:` explicit
+- parole (MariaDB root, admin site) prin variabile de mediu, setate ca Environment Variables in Coolify — nu sunt hardcodate in acest fisier
+- `create-site` e idempotent (verifica daca site-ul exista deja inainte sa incerce sa-l recreeze la un redeploy)
+- portul frontend e mapat pe `8081` (portul 8080 e deja folosit de dashboard-ul Traefik al Coolify)
+
+## Servicii
+
+`backend` (Frappe/ERPNext app server), `db` (MariaDB 11.8), `frontend` (nginx), `queue-long`/`queue-short` (job workers), `scheduler`, `websocket` (realtime), `redis-cache`/`redis-queue`. `configurator` si `create-site` sunt containere one-shot (ruleaza o data la primul deploy).
+
+## Deploy
+
+In Coolify: Application → Docker Compose → acest repo, branch `main`, apoi seteaza env vars `MARIADB_ROOT_PASSWORD` si `ADMIN_PASSWORD`.
+
+Dupa primul deploy reusit, login la `http://<host>:8081` cu user `Administrator` si parola din `ADMIN_PASSWORD`.

docker-compose.yml

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+services:
+  backend:
+    image: frappe/erpnext:v16.28.0
+    restart: unless-stopped
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+    environment:
+      DB_HOST: db
+      DB_PORT: "3306"
+      MYSQL_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD}
+      MARIADB_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD}
+
+  configurator:
+    image: frappe/erpnext:v16.28.0
+    restart: "no"
+    entrypoint:
+      - bash
+      - -c
+    command:
+      - >
+        ls -1 apps > sites/apps.txt;
+        bench set-config -g db_host $$DB_HOST;
+        bench set-config -gp db_port $$DB_PORT;
+        bench set-config -g redis_cache "redis://$$REDIS_CACHE";
+        bench set-config -g redis_queue "redis://$$REDIS_QUEUE";
+        bench set-config -g redis_socketio "redis://$$REDIS_QUEUE";
+        bench set-config -gp socketio_port $$SOCKETIO_PORT;
+    environment:
+      DB_HOST: db
+      DB_PORT: "3306"
+      REDIS_CACHE: redis-cache:6379
+      REDIS_QUEUE: redis-queue:6379
+      SOCKETIO_PORT: "9000"
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+    depends_on:
+      db:
+        condition: service_healthy
+
+  create-site:
+    image: frappe/erpnext:v16.28.0
+    restart: "no"
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+    entrypoint:
+      - bash
+      - -c
+    environment:
+      MARIADB_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD}
+      ADMIN_PASSWORD: ${ADMIN_PASSWORD}
+    command:
+      - >
+        wait-for-it -t 120 db:3306;
+        wait-for-it -t 120 redis-cache:6379;
+        wait-for-it -t 120 redis-queue:6379;
+        export start=`date +%s`;
+        until [[ -n `grep -hs ^ sites/common_site_config.json | jq -r ".db_host // empty"` ]] && \
+          [[ -n `grep -hs ^ sites/common_site_config.json | jq -r ".redis_cache // empty"` ]] && \
+          [[ -n `grep -hs ^ sites/common_site_config.json | jq -r ".redis_queue // empty"` ]];
+        do
+          echo "Waiting for sites/common_site_config.json to be created";
+          sleep 5;
+          if (( `date +%s`-start > 120 )); then
+            echo "could not find sites/common_site_config.json with required keys";
+            exit 1
+          fi
+        done;
+        echo "sites/common_site_config.json found";
+        [[ -f sites/frontend/site_config.json ]] && echo "site already exists, skipping" && exit 0;
+        bench new-site --mariadb-user-host-login-scope='%' --admin-password=$$ADMIN_PASSWORD --db-root-username=root --db-root-password=$$MARIADB_ROOT_PASSWORD --install-app erpnext --set-default frontend;
+    depends_on:
+      configurator:
+        condition: service_completed_successfully
+
+  db:
+    image: mariadb:11.8
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
+      start_period: 5s
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    command:
+      - --character-set-server=utf8mb4
+      - --collation-server=utf8mb4_unicode_ci
+      - --skip-character-set-client-handshake
+    environment:
+      MYSQL_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD}
+      MARIADB_ROOT_PASSWORD: ${MARIADB_ROOT_PASSWORD}
+    volumes:
+      - db-data:/var/lib/mysql
+
+  frontend:
+    image: frappe/erpnext:v16.28.0
+    restart: unless-stopped
+    depends_on:
+      - websocket
+    command:
+      - nginx-entrypoint.sh
+    environment:
+      BACKEND: backend:8000
+      FRAPPE_SITE_NAME_HEADER: frontend
+      SOCKETIO: websocket:9000
+      UPSTREAM_REAL_IP_ADDRESS: 127.0.0.1
+      UPSTREAM_REAL_IP_HEADER: X-Forwarded-For
+      UPSTREAM_REAL_IP_RECURSIVE: "off"
+      PROXY_READ_TIMEOUT: 120
+      CLIENT_MAX_BODY_SIZE: 50m
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+    ports:
+      - "8081:8080"
+
+  queue-long:
+    image: frappe/erpnext:v16.28.0
+    restart: unless-stopped
+    command:
+      - bench
+      - worker
+      - --queue
+      - long,default,short
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+    environment:
+      FRAPPE_REDIS_CACHE: redis://redis-cache:6379
+      FRAPPE_REDIS_QUEUE: redis://redis-queue:6379
+
+  queue-short:
+    image: frappe/erpnext:v16.28.0
+    restart: unless-stopped
+    command:
+      - bench
+      - worker
+      - --queue
+      - short,default
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+    environment:
+      FRAPPE_REDIS_CACHE: redis://redis-cache:6379
+      FRAPPE_REDIS_QUEUE: redis://redis-queue:6379
+
+  redis-queue:
+    image: redis:6.2-alpine
+    restart: unless-stopped
+    volumes:
+      - redis-queue-data:/data
+
+  redis-cache:
+    image: redis:6.2-alpine
+    restart: unless-stopped
+
+  scheduler:
+    image: frappe/erpnext:v16.28.0
+    restart: unless-stopped
+    command:
+      - bench
+      - schedule
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+
+  websocket:
+    image: frappe/erpnext:v16.28.0
+    restart: unless-stopped
+    command:
+      - node
+      - /home/frappe/frappe-bench/apps/frappe/socketio.js
+    environment:
+      FRAPPE_REDIS_CACHE: redis://redis-cache:6379
+      FRAPPE_REDIS_QUEUE: redis://redis-queue:6379
+    volumes:
+      - sites:/home/frappe/frappe-bench/sites
+      - logs:/home/frappe/frappe-bench/logs
+
+volumes:
+  db-data:
+  redis-queue-data:
+  sites:
+  logs: