add .env.example and docker-compose.dev.yml for local dev.

Postgres 16, pgAdmin 8, and env placeholders for backend, ALTCHA, and throttles.

.env.example

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+COMPOSE_PROJECT_NAME=private_image_dev
+
+POSTGRES_HOST=postgres
+POSTGRES_DB=private_image
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_PORT=5432
+
+PGADMIN_DEFAULT_EMAIL=admin@example.com
+PGADMIN_DEFAULT_PASSWORD=admin
+PGADMIN_PORT=5555
+
+BACKEND_PORT=3000
+FRONTEND_PORT=5173
+
+NODE_ENV=development
+
+CORS_ORIGINS=http://localhost:5173,http://127.0.0.1:5173
+
+MAX_IMAGES_PER_UPLOAD=10
+MULTER_MAX_FILE_BYTES=10485760
+
+CAPTCHA_ENABLED=true
+
+ALTCHA_HMAC_KEY=change-me-use-long-random-secret
+ALTCHA_MAX_NUMBER=50000
+
+NEVER_MODE_INACTIVITY_DAYS=365
+
+THROTTLE_UPLOAD_TTL_MS=60000
+THROTTLE_UPLOAD_LIMIT=20
+THROTTLE_HOTLINK_PER_IP_TTL_MS=60000
+THROTTLE_HOTLINK_PER_IP_LIMIT=1000
+THROTTLE_HOTLINK_PER_ID_TTL_MS=60000
+THROTTLE_HOTLINK_PER_ID_LIMIT=120
+
+VITE_MAX_IMAGES_PER_UPLOAD=10

docker-compose.dev.yml

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+services:
+    postgres:
+        image: postgres:16
+        container_name: ${COMPOSE_PROJECT_NAME}_postgres
+        restart: unless-stopped
+        environment:
+            POSTGRES_DB: ${POSTGRES_DB}
+            POSTGRES_USER: ${POSTGRES_USER}
+            POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+        volumes:
+            - private_image_postgres_data:/var/lib/postgresql/data
+        healthcheck:
+            test: ['CMD-SHELL', 'pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}']
+            interval: 5s
+            timeout: 5s
+            retries: 10
+
+    pgadmin:
+        image: dpage/pgadmin4:8
+        container_name: ${COMPOSE_PROJECT_NAME}_pgadmin
+        restart: unless-stopped
+        environment:
+            PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL}
+            PGADMIN_DEFAULT_PASSWORD: ${PGADMIN_DEFAULT_PASSWORD}
+        ports:
+            - '${PGADMIN_PORT}:80'
+        volumes:
+            - private_image_pgadmin_data:/var/lib/pgadmin
+        depends_on:
+            postgres:
+                condition: service_healthy
+
+volumes:
+    private_image_postgres_data:
+    private_image_pgadmin_data: