fix: resolve module structure issues by separating CLI and git modules

- Removed duplicated git module code from cli.rs
- Created dedicated git.rs module with GitRepo, StagedChanges, ChangedFile, FileStatus definitions
- Updated all modules (analyzer, generator, prompt) to import from super::git
- Fixed module organization to resolve compilation errors

src/cli.rs

@@ -15,7 +15,7 @@ pub enum CommitTypeCli {
     Perf,
 }
 
-#[derive(Parser, Debug)]
+#[derive(Debug, Parser)]
 #[command(name = "auto-commit")]
 #[command(author, version, about, long_about = None)]
 pub struct Args {
@@ -35,6 +35,25 @@ pub struct Args {
     pub verbose: bool,
 }
 
+impl std::str::FromStr for CommitTypeCli {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.to_lowercase().as_str() {
+            "feat" | "feature" => Ok(CommitTypeCli::Feat),
+            "fix" | "bug" => Ok(CommitTypeCli::Fix),
+            "docs" | "documentation" => Ok(CommitTypeCli::Docs),
+            "style" => Ok(CommitTypeCli::Style),
+            "refactor" => Ok(CommitTypeCli::Refactor),
+            "test" | "tests" => Ok(CommitTypeCli::Test),
+            "chore" => Ok(CommitTypeCli::Chore),
+            "build" | "ci" => Ok(CommitTypeCli::Build),
+            "perf" | "performance" => Ok(CommitTypeCli::Perf),
+            _ => Err(format!("Unknown commit type: {}", s)),
+        }
+    }
+}
+
 impl From<CommitTypeCli> for CommitType {
     fn from(cli_type: CommitTypeCli) -> Self {
         match cli_type {