Add Docker support with Dockerfile, docker-compose, and entrypoint script; update .gitignore and add .dockerignore

docker-compose.yml

@@ -0,0 +1,38 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: kol-manager:latest
+    container_name: kol-manager
+    restart: unless-stopped
+
+    ports:
+      - "${APP_PORT:-8080}:80"
+
+    # Mount .env.docker as the runtime .env
+    env_file:
+      - .env.docker
+
+    volumes:
+      # Persist the SQLite database across container rebuilds
+      - kol_database:/var/www/html/database
+
+      # Persist uploaded files (talent assets, etc.)
+      - kol_storage:/var/www/html/storage
+
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost/up"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+volumes:
+  # Named volume for SQLite database
+  kol_database:
+    driver: local
+
+  # Named volume for all file uploads / logs / cache
+  kol_storage:
+    driver: local