Add converter module and update documentation

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diff --git a/resources/helpdoc/commands.en.md b/resources/helpdoc/commands.en.md
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+> Welcome to the `JustEnoughVCS` CLI!
+
+## Basic Usage
+jvn <SUBCOMMAND> <ARGUMENT: ?> <FLAG: ?>
+
+## Global Flags
+Global flags for command debugging.
+
+### Language
+**Flag**: `--lang <LANGUAGE>`
+Set program language.
+Options: en / zh-CN
+
+### Confirm
+**Flag**: `--confirm` or `-C`
+Skip confirmation prompts.
+
+### Help
+**Flag**: `--help` or `-h`
+Show command help.
+> Or use `jvn helpdoc <DOCUMENT>` 
+> for full docs.
+
+### Renderer Override
+**Flag**: `--renderer <RENDERER>`
+Override output format.
+Options: json / json-pretty / 
+__         ron  / ron-pretty  / 
+__         yaml / toml
+
+### No Error Output
+**Flag**: `--no-error-logs`
+Suppress error output.
+
+### No Progress Bar
+**Flag**: `--no-progress`
+Disable progress bar.
+
+### Quiet Output
+**Flag**: `--quiet` or `-q`
+Suppress all output for scripts.
+
+### Log Output
+**Flag**: `--verbose` or `-V`
+Enable full output for debugging.