feat(flow): 新增流式执行模式与SSE支持

新增流式执行模式，通过SSE实时推送节点执行事件与日志
重构HTTP执行器与中间件，提取通用HTTP客户端组件
优化前端测试面板，支持流式模式切换与实时日志展示
更新依赖版本并修复密码哈希的随机数生成器问题
修复前端节点类型映射问题，确保Code节点表单可用

backend/Cargo.toml

@@ -1,17 +1,17 @@
 [package]
 name = "udmin"
 version = "0.1.0"
-edition = "2024"   # ✅ 升级到最新 Rust Edition
+edition = "2024"
 default-run = "udmin"
 
 [dependencies]
 axum = "0.8.4"
 tokio = { version = "1.47.1", features = ["full"] }
-tower = "0.5.0"
+tower = "0.5.2"
 tower-http = { version = "0.6.6", features = ["cors", "trace"] }
 hyper = { version = "1" }
 bytes = "1"
-serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0.225", features = ["derive"] }
 serde_json = "1.0"
 serde_with = "3.14.0"
 sea-orm = { version = "1.1.14", features = ["sqlx-mysql", "sqlx-sqlite", "sqlx-postgres", "runtime-tokio-rustls", "macros"] }
@@ -21,30 +21,35 @@ uuid = { version = "1.11.0", features = ["serde", "v4"] }
 chrono = { version = "0.4", features = ["serde"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
-config = "0.14"
-dotenvy = "0.15"
-thiserror = "1.0"
+config = "0.15.16"
+dotenvy = "0.15.7"
+thiserror = "2.0.16"
 anyhow = "1.0"
 once_cell = "1.19.0"
 utoipa = { version = "5.4.0", features = ["axum_extras", "chrono", "uuid"] }
-utoipa-swagger-ui = { version = "6.0.0", features = ["axum"] }
+utoipa-swagger-ui = { version = "9.0.2", features = ["axum"] }
 sha2 = "0.10"
-rand = "0.8"
-async-trait = "0.1"
-redis = { version = "0.27", features = ["tokio-comp", "connection-manager"] }
-petgraph = "0.6"
-rhai = { version = "1.17", features = ["serde", "metadata", "internals"] }
+rand = "0.9.2"
+async-trait = "0.1.89"
+redis = { version = "0.32.5", features = ["tokio-comp", "connection-manager"] }
+petgraph = "0.8.2"
+rhai = { version = "1.23.4", features = ["serde", "metadata", "internals"] }
 serde_yaml = "0.9"
-regex = "1.10"
-reqwest = { version = "0.11", features = ["json", "rustls-tls-native-roots"], default-features = false }
-futures = "0.3"
+regex = "1.11.2"
+reqwest = { version = "0.12.23", features = ["json", "rustls-tls-native-roots"], default-features = false }
+futures = "0.3.31"
 percent-encoding = "2.3"
 # 新增: QuickJS 运行时用于 JS 执行器（不启用额外特性）
-rquickjs = "0.8"
+rquickjs = "0.9.0"
+# 新增: 用于将 mpsc::Receiver 封装为 Stream（SSE）
+tokio-stream = "0.1.17"
 
 [dependencies.migration]
 path = "migration"
 
 [profile.release]
 lto = true
-codegen-units = 1
+codegen-units = 1
+
+[dev-dependencies]
+wiremock = "0.6"