refactor(core): 下沉持久化至 core，统一 workspace 依赖，补全文档注释

- 新增 persist feature（默认关闭），含 key.rs / profile.rs
- Profile TOML 涵盖 host_port、inlet_port、last_ticket、relay 配置
- 首次加载时自动创建默认 profile.toml
- CLI 删除 key.rs / relay.rs / lib.rs / app.rs，合并入 main.rs
- TUI 删除 config.rs，state.rs 改用 sculk_core::persist::Profile
- 共享依赖提升至 workspace.dependencies
- 补全 core 各模块及 TUI state.rs 的文档注释

Author: KercyDing

Cargo.lock

@@ -3,9 +3,16 @@ members = ["core", "cli", "tui"]
 resolver = "3"
 
 [workspace.dependencies]
-anyhow = "1.0.102"
-iroh = "0.96.1"
-tokio = { version = "1.49.0", features = ["full"] }
-tracing = "0.1.44"
-tracing-subscriber = { version = "0.3.22", features = ["env-filter"] }
-clap = { version = "4.5.60", features = ["derive"] }
+sculk-core = { path = "core" }
+anyhow = "1.0"
+iroh = "0.96"
+tokio = { version = "1.49", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+clap = { version = "4.5", features = ["derive"] }
+arboard = "3.6"
+dirs = "6"
+rand = "0.10"
+serde = { version = "1", features = ["derive"] }
+toml = "0.9"
+url = "2.5"

Cargo.toml

@@ -4,12 +4,10 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-sculk-core = { path = "../core" }
+sculk-core = { workspace = true, features = ["persist"] }
 anyhow.workspace = true
-arboard = "3.6.1"
+arboard.workspace = true
 clap.workspace = true
-dirs = "6.0.0"
-rand = "0.10.0"
 tokio.workspace = true
 tracing.workspace = true
 tracing-subscriber.workspace = true