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-assistant/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "ias-assistant"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+ias-ai = { path = "../ias-ai" }
+ias-common = { path = "../ias-common" }
+ias-context = { path = "../ias-context" }
+anyhow = "1"
+serde_json = "1"
+sqlx = { version = "0.9.0", features = [
+    "runtime-tokio",
+    "tls-rustls",
+    "postgres",
+    "chrono",
+] }
+tokio = { version = "1.0", features = ["rt-multi-thread", "macros", "sync", "time"] }
+uuid = { version = "1", features = ["v4", "serde"] }