feat(init): 支持补齐内置模板空目录

新增 init 子命令，根据项目中的 world_*_packs.json 解析实际包目录并创建标准空目录。

改用 .empty-dirs 维护内置模板空目录清单，删除会污染用户项目和网易 Bedrock 加载流程的 .gitkeep 占位文件。

src/commands/init.rs

@@ -0,0 +1,67 @@
+use std::fs;
+
+use crate::commands::InitArgs;
+use crate::entity;
+use crate::error::{CliError, Result};
+use crate::utils::file;
+
+include!(concat!(env!("OUT_DIR"), "/embedded_examples.rs"));
+
+pub fn execute(args: &InitArgs) {
+    if let Err(e) = run_init(args) {
+        eprintln!("❌ 项目初始化失败: {}", e);
+        return;
+    }
+    println!("🍀 项目初始化完成");
+}
+
+fn run_init(args: &InitArgs) -> Result<()> {
+    let project_dir = file::find_project_dir(&args.path)?;
+    let target = args.target.as_deref().unwrap_or("default");
+    let empty_dirs = lookup_empty_dirs(target)?;
+    let release_info = entity::get_current_release_info(&project_dir)?;
+
+    let behavior_pack = format!("behavior_pack_{}", release_info.behavior_identifier);
+    let resource_pack = format!("resource_pack_{}", release_info.resource_identifier);
+
+    let mut created = 0usize;
+    let mut skipped = 0usize;
+
+    for rel in empty_dirs {
+        let rewritten = rewrite_pack_path(rel, &behavior_pack, &resource_pack);
+        let abs = project_dir.join(&rewritten);
+        if abs.is_dir() {
+            skipped += 1;
+            continue;
+        }
+        fs::create_dir_all(&abs).map_err(|e| file::io_error("创建目录", &abs, e))?;
+        println!("📁 创建目录: {}", rewritten);
+        created += 1;
+    }
+
+    println!("✅ 新建 {} 个目录, 跳过 {} 个已存在目录", created, skipped);
+    Ok(())
+}
+
+fn lookup_empty_dirs(target: &str) -> Result<&'static [&'static str]> {
+    EMBEDDED_EXAMPLE_EMPTY_DIRS
+        .iter()
+        .find(|e| e.example == target)
+        .map(|e| e.dirs)
+        .ok_or_else(|| {
+            CliError::NotFound(format!(
+                "example target '{}' was not found in the built-in examples",
+                target
+            ))
+        })
+}
+
+fn rewrite_pack_path(rel: &str, behavior: &str, resource: &str) -> String {
+    if let Some(rest) = rel.strip_prefix("behavior_pack/") {
+        format!("{}/{}", behavior, rest)
+    } else if let Some(rest) = rel.strip_prefix("resource_pack/") {
+        format!("{}/{}", resource, rest)
+    } else {
+        rel.to_string()
+    }
+}

src/commands/mod.rs

@@ -2,6 +2,7 @@ use clap::{Args, Parser, Subcommand, arg};
 
 pub mod components;
 pub mod create;
+pub mod init;
 pub mod release;
 
 #[derive(Parser)]
@@ -24,6 +25,8 @@ pub enum Commands {
     Release(ReleaseArgs),
     /// Create a new mod project
     Create(CreateArgs),
+    /// Initialize standard empty directories for an existing project
+    Init(InitArgs),
     /// Create a new component
     Components(ComponentsArgs),
 }
@@ -52,6 +55,16 @@ pub struct CreateArgs {
     pub target: Option<String>,
 }
 
+#[derive(Args)]
+pub struct InitArgs {
+    /// The path of the project (default: current directory)
+    #[arg(short, long)]
+    pub path: Option<String>,
+    /// Example target whose layout to apply
+    #[arg(short, long)]
+    pub target: Option<String>,
+}
+
 #[derive(Args)]
 pub struct ComponentsArgs {
     /// The path of the project

src/main.rs

@@ -12,6 +12,7 @@ fn main() {
     match &cli.command {
         Commands::Release(args) => commands::release::execute(args),
         Commands::Create(args) => commands::create::execute(args),
+        Commands::Init(args) => commands::init::execute(args),
         Commands::Components(args) => commands::components::execute(args),
     }
 }