feat: 拆分 worker 架构并增强 assistant 安全保护

- 新增 daemon/channel/assistant/function/scheduler/logging worker 架构和 JetStream 消息协议

- 修复邮件通知误入 assistant、迁移 checksum、日志 subject 和工具调用无限循环风险

- 新增 assistant 工具轮次熔断、工具结果截断和提示词软收敛规则

- 补充邮件推送关键字、可信发件人配置、升级日志和验证测试

ias-common/Cargo.toml

@@ -1,15 +1,27 @@
 [package]
 name = "ias-common"
-version = "0.1.2"
+version = "0.2.0"
 edition = "2024"
 
 [dependencies]
+# ── NATS JetStream ──
+async-nats = "0.49.1"
 # ── HTTP 客户端 ──
 reqwest = { version = "0.12", default-features = false, features = ["json", "stream", "rustls-tls"] }  # HTTP 请求（微信 API + DeepSeek API + 工具调用）
 # ── 序列化 ──
 serde = { version = "1.0", features = ["derive"] }            # 序列化/反序列化
 serde_json = "1.0"                                             # JSON 处理
 serde_yaml = "0.9"
+# ── 异步流工具 ──
+futures-util = "0.3"
+tokio = { version = "1.0", features = ["rt", "sync"] }
 # ── 错误处理 ──
 anyhow = "1"
 thiserror = "2"
+# ── 时间处理 ──
+chrono = { version = "0.4", features = ["serde"] }
+# ── 唯一标识 ──
+uuid = { version = "1", features = ["v4", "serde"] }
+
+[dev-dependencies]
+tokio = { version = "1.0", features = ["rt-multi-thread", "macros", "sync", "time"] }