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, 109 insertions, 0 deletions

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+<h1 align="center">Multi-Command Program</h1>
+<p align="center">
+    Adding multiple commands to a single program
+</p>
+
+Real-world CLIs rarely have just one command. Let's extend our previous greet program by adding a second command, and see what a multi-command program looks like.
+
+## Adding a Second Command
+
+Work in the same project:
+
+```rust
+// Declare two commands
+dispatcher!("greet", CMDGreet => EntryGreet);
+dispatcher!("add",   CMDAdd   => EntryAdd);
+ 
+pack!(ResultGreeting = String);
+pack!(ResultSum = i32);
+ 
+#[chain]
+fn handle_greet(args: EntryGreet) -> Next {
+    let name = args.inner.first().cloned().unwrap_or_else(|| "World".to_string());
+    ResultGreeting::new(name)
+}
+ 
+#[chain]
+fn handle_add(args: EntryAdd) -> Next {
+    let sum: i32 = args.inner.iter().filter_map(|s| s.parse::<i32>().ok()).sum();
+    ResultSum::new(sum)
+}
+ 
+#[renderer]
+fn render_greet(result: ResultGreeting) {
+    r_println!("Hello, {}!", *result);
+}
+ 
+#[renderer]
+fn render_sum(result: ResultSum) {
+    r_println!("Sum: {}", *result);
+}
+ 
+fn main() {
+    let mut program = ThisProgram::new();
+    program.with_dispatchers((CMDGreet, CMDAdd));
+    program.exec_and_exit();
+}
+ 
+gen_program!();
+```
+ 
+Both commands share the same pipeline model, but each has its own path:
+
+```text
+> my-cli greet Alice
+Hello, Alice!
+> my-cli add 1 2 3
+Sum: 6
+```
+ 
+## Registering Multiple Dispatchers
+
+Notice `with_dispatchers`? When you need to register multiple dispatchers, just pass them as a tuple:
+
+```rust
+@@@dispatcher!("greet", CMDGreet => EntryGreet);
+@@@dispatcher!("add", CMDAdd => EntryAdd);
+@@@pack!(ResultGreeting = String);
+@@@pack!(ResultSum = i32);
+@@@#[chain] fn handle_greet(_args: EntryGreet) -> Next { ResultGreeting::new("ok".into()) }
+@@@#[renderer] fn render_greet(_greeting: ResultGreeting) { r_println!("hi"); }
+@@@#[chain] fn handle_add(_args: EntryAdd) -> Next { ResultSum::new(0) }
+@@@#[renderer] fn render_sum(_sum: ResultSum) { r_println!("sum"); }
+fn main() {
+    let mut program = ThisProgram::new();
+    program.with_dispatchers((CMDGreet, CMDAdd));
+    program.exec_and_exit();
+}
+```
+ 
+This is equivalent to registering them one by one, same effect.
+
+> [!TIP]
+> The tuple supports up to 7 dispatchers. For more than 7, chain `with_dispatcher` calls instead.
+
+## Subcommands
+
+Multi-level commands work the same way—each dot-separated level is just part of the name:
+
+```rust
+dispatcher!("remote.add", CMDRemoteAdd => EntryRemoteAdd);
+dispatcher!("remote.rm",  CMDRemoteRm  => EntryRemoteRm);
+```
+ 
+Each subcommand's Entry, Chain, and Renderer are completely independent and don't interfere.
+
+## Type Independence
+
+Notice we used two different `pack!` macros:
+
+- `pack!(ResultGreeting = String)`
+- `pack!(ResultSum = i32)`
+
+They are independent types, and `gen_program!()` assigns them different enum variants.
+
+The dispatcher will never route `ResultGreeting` data to `render_sum` — **type safety is guaranteed from the naming stage**.
+
+<p align="center" style="font-size: 0.85em; color: gray;">
+    Written by @Weicao-CatilGrass
+</p>