feat(infra): 雲端就緒 P1 — Session/Log/Scheduler 改造

- Dockerfile：移除 cron 安裝與 scheduler crontab 設定
- docker-entrypoint.sh：移除 service cron start
- docker-compose.yml：新增 scheduler service（php artisan schedule:work）
- .env.example：SESSION_DRIVER=redis、LOG_CHANNEL=stderr、移除 LOG_STACK/LOG_DAILY_DAYS
- docs/STARTUP.md：新增 Log 查看、VPS 維護窗口操作與 Rollback 說明

VPS 部署需手動更新 .env 並執行 docker compose up -d --build（詳見 STARTUP.md §11）

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

docker-compose.yml

@@ -110,6 +110,27 @@ services:
       - "127.0.0.1:3306:3306" # 只綁 localhost，不對外
 
 
+  scheduler:
+    image: cfdive-platform
+    container_name: cfdive-scheduler
+    restart: unless-stopped
+    working_dir: /var/www/
+    command: php artisan schedule:work
+    volumes:
+      - ./:/var/www
+    environment:
+      - DB_CONNECTION=mysql
+      - DB_HOST=db
+      - DB_PORT=3306
+      - DB_DATABASE=${DB_DATABASE:-CFDivePlatform}
+      - DB_USERNAME=${DB_USERNAME:-cfdiveuser}
+      - DB_PASSWORD=${DB_PASSWORD}
+    networks:
+      - cfdive-network
+    depends_on:
+      app:
+        condition: service_healthy
+
   queue-worker:
     image: cfdive-platform
     container_name: cfdive-queue