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.yml

@@ -1,8 +1,8 @@
 # ============================================================
-# opsx-loki - Development Docker Compose Configuration
+# lokistack - Development Docker Compose Configuration
 # ============================================================
 # P0 Fixes:
-#   - Non-root kubeconfig mount (/home/opsxloki/.kube)
+#   - Non-root kubeconfig mount (/home/lokistack/.kube)
 #   - Healthcheck for orchestration visibility
 #   - Resource limits to prevent noisy-neighbor
 #   - security_opt: no-new-privileges
@@ -14,15 +14,15 @@
 # ============================================================
 
 services:
-  opsxloki:
+  lokistack:
     build:
       context: .
       dockerfile: Dockerfile
       args:
         TARGETARCH: ${TARGETARCH:-amd64}
     image: lghost/lokistack:latest
-    container_name: opsxloki
-    hostname: opsxloki
+    container_name: lokistack
+    hostname: lokistack
 
     # ---- P0: Security options ----
     security_opt:
@@ -43,11 +43,11 @@ services:
 
     # ---- P0: Named volumes for data persistence ----
     volumes:
-      - opsxloki-data:/app/data
+      - lokistack-data:/app/data
       # P0: Mount kubeconfig to non-root user directory
-      - ${KUBECONFIG_PATH:-${HOME}/.kube}:/home/opsxloki/.kube:ro
+      - ${KUBECONFIG_PATH:-${HOME}/.kube}:/home/lokistack/.kube:ro
       # SSH keys for host-based deployments
-      - ${SSH_KEY_PATH:-${HOME}/.ssh}:/home/opsxloki/.ssh:ro
+      - ${SSH_KEY_PATH:-${HOME}/.ssh}:/home/lokistack/.ssh:ro
 
     # ---- P0: Environment variables (no default secrets) ----
     environment:
@@ -60,7 +60,7 @@ services:
       # P0: ENCRYPTION_KEY must be provided externally (AES-256, >=32 字符)
       - "ENCRYPTION_KEY=${ENCRYPTION_KEY:?ENCRYPTION_KEY is required. Generate: openssl rand -hex 32, then: export ENCRYPTION_KEY=<value>}"
       # KUBECONFIG points to non-root user's .kube directory
-      - KUBECONFIG=/home/opsxloki/.kube/config
+      - KUBECONFIG=/home/lokistack/.kube/config
 
     # ---- P0: Healthcheck ----
     healthcheck:
@@ -95,21 +95,21 @@ services:
     stop_grace_period: 15s
 
     networks:
-      - opsxloki-net
+      - lokistack-net
 
 # ---- Named volumes ----
 volumes:
-  opsxloki-data:
+  lokistack-data:
     driver: local
     labels:
-      - "com.opsxloki.description=opsx-loki data directory"
+      - "com.lokistack.description=lokistack data directory"
 
 # ---- Network isolation ----
 networks:
-  opsxloki-net:
+  lokistack-net:
     driver: bridge
     ipam:
       config:
         - subnet: 172.28.0.0/16
     labels:
-      - "com.opsxloki.description=opsx-loki internal network"
+      - "com.lokistack.description=lokistack internal network"