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

uv.lock

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     { name = "celery" },
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     { name = "fastapi" },
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     { name = "asyncpg", specifier = ">=0.30" },
     { name = "celery", specifier = ">=5.4" },
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     { name = "fastapi", specifier = ">=0.115" },
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