feat(domains): identity, billing, task services and domain placeholders

Billing implements reserve -> commit -> refund against bl_quota and bl_ledger
with row-level locking and idempotency keys; the refund commits on its own
transaction so a failed request cannot silently keep a user's quota. Task
implements the unified task centre over the state machine. Identity issues and
resolves users. Remaining domains are placeholders whose READMEs state what
belongs there and what must not.
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# `packages/rules/` — 规则引擎(占位)
架构 §8.1 / ADR-05:自研数据驱动决策表(TD-10)。
## 待实现
- 从 `kb_rule` 读已发布规则,求值并输出**命中链**
- 硬约束(`is_hard`)校验:可拦截违规输出
- p95 < 50ms(FR-KB-05)
## 设计约束
- **规则是数据不是代码**。求值器是代码,规则本身在 `kb_rule` 表里,
顾问在后台维护,改规则不发版(NFR-MAINT-05)。
- 每次求值必须输出**命中了哪几条规则**,这是报告与 Agent 可解释性的来源,
也是 `pf_diagnosis.rule_hits` 与 `ag_message.rule_hits` 的数据来源。
- 已发布规则集缓存在进程内 + Redis,TTL 5 分钟,发布时广播失效(架构 §10)。
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"""规则引擎:决策表求值、硬约束校验、命中链输出。占位。"""