feat: 平台治理与权限体系完善，存储进度/GPU预留/审批中心与日志整合

- 平台治理: 租户用户权限层次、资源ACL、审批中心与审批模板、访问申请
- 存储: MinIO 存储进度迁移、对象存储安全加固与测试
- 计算: GPU 资源预留、compute 轮询与同步增强
- 权限: permission v2 迁移、权限安全验收测试
- 日志: 后端运行日志中文说明、操作日志整合
- 数据处理/评测: 数据转换与模型评测优化

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

backend/app/db/sql/011_permission_lifecycle.sql

@@ -0,0 +1,20 @@
+-- Permission 2.0: user and inference task lifecycle tombstones.
+-- Additive migration, safe to execute repeatedly.
+
+ALTER TABLE users ADD COLUMN IF NOT EXISTS deleted_at TEXT;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS deleted_by TEXT;
+ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS deleted_at TEXT;
+ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS deleted_by TEXT;
+ALTER TABLE eval_tasks ADD COLUMN IF NOT EXISTS created_by TEXT;
+ALTER TABLE eval_tasks ADD COLUMN IF NOT EXISTS tenant_id TEXT;
+ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS created_by TEXT;
+ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS tenant_id TEXT;
+ALTER TABLE data_convert_tasks ADD COLUMN IF NOT EXISTS deleted_by TEXT;
+ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS deleted_at TEXT;
+ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS deleted_by TEXT;
+ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS cleanup_attempts INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS last_cleanup_error TEXT;
+ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS last_verified_at TEXT;
+
+CREATE INDEX IF NOT EXISTS idx_users_active ON users(status, deleted_at);
+CREATE INDEX IF NOT EXISTS idx_compare_tasks_active ON compare_tasks(status, deleted_at);