feat(llm): 实现 Phase 0 剩余四个模块

实现 ProviderRegistry、HookExecutor、StreamEvents 和 Auto-compaction 模块，并集成到 LlmCycle 中

Cargo.toml

@@ -5,13 +5,19 @@ edition = "2024"
 
 [dependencies]
 tokio = { version = "1", features = ["full"] }
-reqwest = { version = "0.12", features = ["json"] }
+reqwest = { version = "0.12", features = ["json", "stream"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 thiserror = "2"
 async-trait = "0.1"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+tokio-stream = "0.1"
+futures = "0.3"
+futures-util = "0.3"
+futures-core = "0.3"
+bytes = "1"
+async-stream = "0.3"
 
 [dev-dependencies]
 dotenvy = "0.15.7"