feat(docs): add Chinese and English documentation for Mingling tutorials

Add comprehensive documentation covering Declare a Dispatcher, Declare a
Chain, Rendering Results, Multi-Command Program, Argument Parsing with
Picker and Clap, Program Setup, Error Handling, Help Info, Resource
System, Exit Code Control, Hook System, Testing, Completion, Structural
Rendering, and Core Concepts

1 files changed, 120 insertions, 0 deletions

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+<h1 align="center">错误处理</h1>
+<p align="center">
+    将错误优雅地展示给用户
+</p>
+
+管线里不只有成功路径。当输入有误、资源找不到、操作失败时，你需要一个地方来处理这些"意外"，而不是让程序 panic。
+
+## 两个路径：成功 vs 错误
+
+回顾管线模型，Chain 的返回值是 `Next`，它有两个去向：
+
+| 路由           | 含义                         |
+| -------------- | ---------------------------- |
+| `.to_render()` | 出结果了，交给 Renderer 展示 |
+| `.to_chain()`  | 还没处理完，交给下一个 Chain |
+
+错误类型的值也可以走任意一条路——你可以选择直接渲染错误信息，也可以交给下一个 Chain 尝试恢复。
+
+## 用独立类型区分错误
+
+```rust
+@@@dispatcher!("greet", CMDGreet => EntryGreet);
+pack!(ResultGreeting = String);
+pack!(ErrorNameEmpty = String);
+ 
+#[chain]
+fn handle_greet(args: EntryGreet) -> Next {
+    let name = args.inner.first().cloned().unwrap_or_default();
+ 
+    if name.is_empty() {
+        ErrorNameEmpty::new("name is required".to_string()).to_render()
+    } else {
+        ResultGreeting::new(name).to_render()
+    }
+}
+```
+ 
+然后各自写 Renderer：
+
+```rust
+@@@dispatcher!("greet", CMDGreet => EntryGreet);
+@@@pack!(ResultGreeting = String);
+@@@pack!(ErrorNameEmpty = String);
+@@@#[chain] fn handle_greet(args: EntryGreet) -> Next { ResultGreeting::new(args.inner.first().cloned().unwrap_or_default()).to_render() }
+ 
+#[renderer]
+fn render_greeting(result: ResultGreeting) {
+    r_println!("Hello, {}!", *result);
+}
+ 
+#[renderer]
+fn render_error_name_empty(err: ErrorNameEmpty) {
+    r_println!("Error: {}", *err);
+}
+```
+ 
+两个 Renderer 各司其职，用户看到什么取决于 Chain 返回了什么。
+
+## 完整的例子
+
+```rust
+dispatcher!("greet", CMDGreet => EntryGreet);
+ 
+pack!(ResultGreeting = String);
+pack!(ErrorNameEmpty = String);
+ 
+#[chain]
+fn handle_greet(args: EntryGreet) -> Next {
+    let name = args.inner.first().cloned().unwrap_or_default();
+    if name.is_empty() {
+        ErrorNameEmpty::new("name is required".to_string()).to_render()
+    } else {
+        ResultGreeting::new(name).to_render()
+    }
+}
+ 
+#[renderer]
+fn render_greeting(result: ResultGreeting) {
+    r_println!("Hello, {}!", *result);
+}
+ 
+#[renderer]
+fn render_error_name_empty(err: ErrorNameEmpty) {
+    r_println!("Error: {}", *err);
+}
+ 
+fn main() {
+    let mut program = ThisProgram::new();
+    program.with_dispatcher(CMDGreet);
+    program.exec_and_exit();
+}
+ 
+gen_program!();
+```
+ 
+运行效果：
+
+```text
+~# my-cli greet Alice
+Hello, Alice!
+ 
+~# my-cli greet
+Error: name is required
+```
+ 
+## 关于 `pack_err!`
+
+如果你启用了 `extra_macros`，还可以用 `pack_err!` 快速声明带有自动 `name` 字段的错误类型：
+
+```rust
+// Features: ["extra_macros"]
+pack_err!(ErrorNotFound);
+// 生成: struct ErrorNotFound { pub name: String }
+```
+ 
+详见 [特性列表](pages/other/features)。
+
+<p align="center" style="font-size: 0.85em; color: gray;">
+    Written by @Weicao-CatilGrass
+</p>