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/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