fix: admin 审批链路查询条件缺失与网关路由缺失

SearchUserVerifications 查询条件硬编码了 user_id=0 导致 admin 查询
始终返回空列表，改为条件构建模式。envoy 缺少 /api/v1/admin 前缀
路由导致审批接口 404。新增 users-rpc 启动时从环境变量自动初始化
管理员账户。

deploy/dev/.env

@@ -30,3 +30,8 @@ S3_ACCESS_KEY=changeme
 S3_SECRET_KEY=changeme
 S3_BUCKET_NAME=dev-bucket
 S3_REGION=auto
+
+# Admin (auto-init on first startup)
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=admin123
+ADMIN_EMAIL=admin@juwan.dev

deploy/dev/docker-compose.yml

@@ -118,6 +118,10 @@ services:
     container_name: juwan-user-rpc
     restart: unless-stopped
     env_file: .env
+    environment:
+      ADMIN_USERNAME: ${ADMIN_USERNAME}
+      ADMIN_PASSWORD: ${ADMIN_PASSWORD}
+      ADMIN_EMAIL: ${ADMIN_EMAIL}
     depends_on:
       postgres:
         condition: service_healthy

deploy/dev/envoy.yaml

@@ -235,6 +235,12 @@ static_resources:
                             cluster: user_api_cluster
                             timeout: 30s
 
+                        - match:
+                            prefix: /api/v1/admin
+                          route:
+                            cluster: user_api_cluster
+                            timeout: 30s
+
                         - match:
                             prefix: /api/v1/users
                           route: