chore(prep): shared groundwork for the parallel task batch

多 agent 并行批次的协调提交（消除全部共享文件冲突面）：
- 迁移 0004：id_session + ob_event 两表（T3/T4 用，任务不再写迁移）
- ORM：UserSession / ObEvent；错误码：九个新码（40xxx/60006，含 meta）
- 配置：四档 tiers / refresh TTL / 任务奖励注册表 / 埋点上限 / COS 直传全套
- 骨架：packages/analytics + packages/storage + events/uploads 空路由（已注册）
- deps：AnalyticsServiceDep / StorageServiceDep；DailyBudgetGuard 接收 tiers
- uv add cos-python-sdk-v5；import-linter/CI/Makefile 纳入两个新包

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
       - name: Mypy (strict scope)
         run: uv run mypy packages/domain packages/llm
       - name: Mypy (remaining scope)
-        run: uv run mypy apps packages/shared packages/identity packages/billing packages/task packages/agent packages/compliance
+        run: uv run mypy apps packages/shared packages/identity packages/billing packages/task packages/agent packages/compliance packages/analytics packages/storage
 
       # --- 防线 3: 分层依赖检查 (架构文档 §4.2) ---
       - name: Import contracts