revert(stack): un-merge docker-dev-sync, restore as independent B-route directory

docker-dev 清理合并残留：去掉 rsync/mkdir/chmod、删 ulthon_admin_sync 服务、
删 .env(COMPOSE_PROFILES)、删 sync.sh、删 .dockerignore、去 SYNC_INTERVAL。
docker-dev-sync 恢复独立目录并 B-route 化（context: ../../..）。
两个模式各自独立、各自完整。

source/stack/docker-dev-sync/docker-compose.yaml

@@ -0,0 +1,59 @@
+
+# 一般不需要配置name，默认是目录名，但是如果你的系统中有同名的目录，需要手动配置
+# name: ulthon_admin
+
+services:
+    ulthon_admin:
+        build:
+            context: ../../..
+            dockerfile: source/stack/docker-dev-sync/Dockerfile
+        restart: unless-stopped
+        ports:
+            - "8000:8000"
+        volumes:
+            # Host code mounted to staging area (not the runtime directory)
+            # sync.sh will rsync from here to /var/www/html
+            - ../../..:/var/www/source
+        environment:
+            # Sync polling interval in seconds (default: 3)
+            - SYNC_INTERVAL=${SYNC_INTERVAL:-3}
+        extra_hosts:
+            - "host.docker.internal:host-gateway"
+        depends_on:
+            mysql:
+                condition: service_healthy
+
+    mysql:
+        image: mysql:8.0
+        restart: unless-stopped
+        ports:
+            - "13306:3306"
+        environment:
+            MYSQL_ROOT_PASSWORD: root
+            MYSQL_DATABASE: ulthon
+        volumes:
+            - ../../../docker-dev-data/mysql:/var/lib/mysql
+        healthcheck:
+            test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+            interval: 10s
+            timeout: 5s
+            retries: 5
+
+    redis:
+        image: redis:7-alpine
+        restart: unless-stopped
+        ports:
+            - "16379:6379"
+        volumes:
+            - ../../../docker-dev-data/redis:/data
+
+    phpmyadmin:
+        image: phpmyadmin:latest
+        restart: unless-stopped
+        ports:
+            - "18888:80"
+        environment:
+            PMA_HOST: mysql
+        depends_on:
+            mysql:
+                condition: service_healthy