fix: gunicorn + wait-for-db + healthcheck en docker-compose

- entrypoint.sh: sustituye runserver por gunicorn (workers=2, timeout=120)
- entrypoint.sh: espera a PostgreSQL antes de migrar cuando DB_HOST está definido
- docker-compose.yml: unifica nombre de servicio db, añade healthcheck robusto,
  corrige env_file path a ../.env

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deployments/docker-compose.yml

@@ -1,45 +1,41 @@
 version: '3.8'
 
 services:
-  gitea-db:
-    image: postgres:15
-    # Usará el nombre de tu .env (django_db_local)
-    container_name: ${DB_CONTAINER_NAME:-django_db_dev}
-    restart: always
+  db:
+    image: postgres:15-alpine
+    container_name: ${DB_CONTAINER_NAME:-django_core_db}
+    restart: unless-stopped
     environment:
-      POSTGRES_DB: ${DB_NAME:-gitea}
-      POSTGRES_USER: ${DB_USER:-gitea}
-      POSTGRES_PASSWORD: ${DB_PASSWORD:-gitea}
+      POSTGRES_DB: ${DB_NAME:-django_core_db}
+      POSTGRES_USER: ${DB_USER:-postgres}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-postgres}
     volumes:
       - postgres_data:/var/lib/postgresql/data
-    # --- ESTO ES LO QUE FALTA ---
     ports:
       - "${DATABASE_EXPOSE_PORT:-5432}:5432"
-    # ----------------------------
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-gitea} -d ${DB_NAME:-gitea}"]
+      test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-postgres} -d ${DB_NAME:-django_core_db}"]
       interval: 5s
       timeout: 5s
-      retries: 5
+      retries: 10
+      start_period: 10s
 
   web:
     build:
       context: ..
       dockerfile: deployments/Dockerfile
-    container_name: ${APP_CONTAINER_NAME:-django_app_dev}
-    restart: always
+    container_name: ${APP_CONTAINER_NAME:-django_core_app}
+    restart: unless-stopped
     env_file:
-      - .env
+      - ../.env
     environment:
-      - DEBUG=${DEBUG_MODE:-1}
-      # IMPORTANTE: Este nombre debe coincidir con el nombre del servicio arriba (gitea-db)
-      - DB_HOST=gitea-db  
+      - DB_HOST=db
       - DB_PORT=5432
     ports:
       - "${PORT:-8000}:8000"
     depends_on:
-      gitea-db:
+      db:
         condition: service_healthy
 
 volumes:
-  postgres_data:
+  postgres_data: