refactor: 资源名 opsx-loki/opsxloki → lokistack（线上已迁移完成）

【已在线完成，零数据丢失】
K8s ns=log 资源全部改名：
  Deployment  opsx-loki          → lokistack
  Service     opsx-loki          → lokistack
  Service     opsx-loki-nodeport → lokistack-nodeport
  PVC         opsxloki-data      → lokistack-data
  Secret      opsxloki-secrets   → lokistack-secrets
  Label       app: opsx-loki     → app: lokistack
  Ingress     log.astx.club 后端  → lokistack-nodeport:8080
  镜像        lghost/opsxloki     → lghost/lokistack
  docker-compose 卷/容器名同步更名

【保留不变（改了会出事）】
  namespace: log
  数据文件名 opsxloki.json（代码硬编码）
  容器内路径 /app/data

【迁移过程】
  1. 备份 PVC 数据(32KB) + Secret 原值 + 旧 yaml → /root/lokistack-migration-backup-20261026-171141
  2. scale 旧 Deployment → 0，等 Pod 消失
  3. 复制 Secret（JWT sha256 校验一致）
  4. 新建 PVC lokistack-data（Bound 30Gi cbs）
  5. 临时 Pod 恢复数据（chown 1000:1000，opsxloki.json 保留 0600）
  6. apply 新 Deployment → 1/1 Running
  7. 修复 Ingress 后端（TKE qcloud 要求 NodePort）→ CLB 恢复 200
  8. 删除旧 Deployment / 失效 Service

【验证】
  lokistack 1/1，0 重启，镜像 lghost/lokistack:latest（statically linked）
  /api/v1/health → {"status":"ok","version":"2.0.0"}
  /app/data/opsxloki.json 610B 完整（admin 用户 + 配置）
  http://log.astx.club/ → HTTP 200
  镜像加固：admin123=0、/app/backend/=0、initial-admin-password.txt 存在

【回滚兜底（建议 7 天后删）】
  pvc/opsxloki-data、secret/opsxloki-secrets

【文档】
  README 新增「从 opsx-loki 升级」章节：
  K8s 七步迁移脚本 + docker-compose 卷迁移命令

docker-compose.prod.yml

@@ -1,5 +1,5 @@
 # ============================================================
-# opsx-loki - Production Docker Compose Configuration
+# lokistack - Production Docker Compose Configuration
 # ============================================================
 # Features:
 #   - Multi-instance deployment with load balancing
@@ -15,14 +15,14 @@ services:
   # ---- Nginx Load Balancer ----
   nginx:
     image: nginx:1.27-alpine
-    container_name: opsxloki-lb
+    container_name: lokistack-lb
     restart: unless-stopped
     ports:
       - "8080:8080"
     volumes:
       - ./nginx.conf:/etc/nginx/nginx.conf:ro
     networks:
-      - opsxloki-net
+      - lokistack-net
     healthcheck:
       test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:8080/health"]
       interval: 30s
@@ -52,21 +52,21 @@ services:
       - /var/cache/nginx:noexec,nosuid,size=10m
       - /var/run:noexec,nosuid,size=5m
     depends_on:
-      opsxloki-1:
+      lokistack-1:
         condition: service_healthy
-      opsxloki-2:
+      lokistack-2:
         condition: service_healthy
 
   # ---- Application Instance 1 ----
-  opsxloki-1:
+  lokistack-1:
     build:
       context: .
       dockerfile: Dockerfile
       args:
         TARGETARCH: ${TARGETARCH:-amd64}
     image: lghost/lokistack:latest
-    container_name: opsxloki-1
-    hostname: opsxloki-1
+    container_name: lokistack-1
+    hostname: lokistack-1
     restart: unless-stopped
 
     security_opt:
@@ -85,16 +85,16 @@ services:
 
     volumes:
       # Named volume for data persistence
-      - opsxloki-data-1:/app/data
+      - lokistack-data-1:/app/data
       # kubeconfig read-only (P0: non-root path)
-      - ${KUBECONFIG_PATH:-~/.kube}:/home/opsxloki/.kube:ro
+      - ${KUBECONFIG_PATH:-~/.kube}:/home/lokistack/.kube:ro
       # SSH keys read-only
-      - ${SSH_KEY_PATH:-~/.ssh}:/home/opsxloki/.ssh:ro
+      - ${SSH_KEY_PATH:-~/.ssh}:/home/lokistack/.ssh:ro
 
     environment:
       - SERVER_PORT=8080
       - DATA_DIR=/app/data
-      - KUBECONFIG=/home/opsxloki/.kube/config
+      - KUBECONFIG=/home/lokistack/.kube/config
       # Secrets via Docker Secrets file injection
       - JWT_SECRET_FILE=${JWT_SECRET_FILE:-/run/secrets/jwt_secret}
       - ENCRYPTION_KEY_FILE=${ENCRYPTION_KEY_FILE:-/run/secrets/encryption_key}
@@ -136,18 +136,18 @@ services:
 
     stop_grace_period: 30s
     networks:
-      - opsxloki-net
+      - lokistack-net
 
   # ---- Application Instance 2 ----
-  opsxloki-2:
+  lokistack-2:
     build:
       context: .
       dockerfile: Dockerfile
       args:
         TARGETARCH: ${TARGETARCH:-amd64}
     image: lghost/lokistack:latest
-    container_name: opsxloki-2
-    hostname: opsxloki-2
+    container_name: lokistack-2
+    hostname: lokistack-2
     restart: unless-stopped
 
     security_opt:
@@ -163,14 +163,14 @@ services:
       - /tmp:noexec,nosuid,size=50m,uid=1000,gid=1000
 
     volumes:
-      - opsxloki-data-2:/app/data
-      - ${KUBECONFIG_PATH:-~/.kube}:/home/opsxloki/.kube:ro
-      - ${SSH_KEY_PATH:-~/.ssh}:/home/opsxloki/.ssh:ro
+      - lokistack-data-2:/app/data
+      - ${KUBECONFIG_PATH:-~/.kube}:/home/lokistack/.kube:ro
+      - ${SSH_KEY_PATH:-~/.ssh}:/home/lokistack/.ssh:ro
 
     environment:
       - SERVER_PORT=8080
       - DATA_DIR=/app/data
-      - KUBECONFIG=/home/opsxloki/.kube/config
+      - KUBECONFIG=/home/lokistack/.kube/config
       - JWT_SECRET_FILE=${JWT_SECRET_FILE:-/run/secrets/jwt_secret}
       - ENCRYPTION_KEY_FILE=${ENCRYPTION_KEY_FILE:-/run/secrets/encryption_key}
 
@@ -209,13 +209,13 @@ services:
 
     stop_grace_period: 30s
     networks:
-      - opsxloki-net
+      - lokistack-net
 
 # ---- Named Volumes ----
 volumes:
-  opsxloki-data-1:
+  lokistack-data-1:
     driver: local
-  opsxloki-data-2:
+  lokistack-data-2:
     driver: local
 
 # ---- Docker Secrets ----
@@ -227,7 +227,7 @@ secrets:
 
 # ---- Network ----
 networks:
-  opsxloki-net:
+  lokistack-net:
     driver: bridge
     ipam:
       config: