Add Docker one-click deploy and data migration docs.

Enable PHP 8.2 + Apache compose stack with persistent data/uploads volumes and PhpSpreadsheet for xlsx import/export.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -0,0 +1,13 @@
+services:
+  web:
+    build: .
+    container_name: baota-archive
+    ports:
+      - "${APP_PORT:-8080}:80"
+    volumes:
+      # 持久化业务数据（SQLite + JSON）与上传文件
+      - ./data:/var/www/html/data
+      - ./uploads:/var/www/html/uploads
+    environment:
+      TZ: Asia/Shanghai
+    restart: unless-stopped