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/007_platform_completion.sql

@@ -0,0 +1,33 @@
+-- 平台可靠性闭环：导出权限、对象清理、缓存 manifest 元数据。
+BEGIN;
+
+ALTER TABLE model_export_jobs ADD COLUMN IF NOT EXISTS created_by TEXT;
+ALTER TABLE model_export_jobs ADD COLUMN IF NOT EXISTS tenant_id TEXT;
+ALTER TABLE model_export_jobs ADD COLUMN IF NOT EXISTS archive_status TEXT NOT NULL DEFAULT 'pending';
+ALTER TABLE model_export_jobs ADD COLUMN IF NOT EXISTS archive_error 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;
+
+ALTER TABLE storage_cache_jobs ADD COLUMN IF NOT EXISTS version_id TEXT;
+ALTER TABLE storage_cache_jobs ADD COLUMN IF NOT EXISTS checksum_sha256 TEXT;
+ALTER TABLE storage_cache_jobs ADD COLUMN IF NOT EXISTS byte_size BIGINT NOT NULL DEFAULT 0;
+ALTER TABLE storage_cache_jobs ADD COLUMN IF NOT EXISTS last_accessed_at TEXT;
+ALTER TABLE storage_cache_jobs ADD COLUMN IF NOT EXISTS protected_until TEXT;
+
+CREATE TABLE IF NOT EXISTS storage_cleanup_jobs (
+    id TEXT PRIMARY KEY,
+    storage_object_id TEXT NOT NULL REFERENCES storage_objects(id) ON DELETE CASCADE,
+    action TEXT NOT NULL DEFAULT 'delete',
+    status TEXT NOT NULL DEFAULT 'pending',
+    attempts INTEGER NOT NULL DEFAULT 0,
+    error TEXT,
+    create_time TEXT NOT NULL,
+    completed_at TEXT
+);
+CREATE INDEX IF NOT EXISTS idx_storage_cleanup_status ON storage_cleanup_jobs(status, create_time);
+
+COMMIT;