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

Cargo.toml

@@ -2,10 +2,17 @@
 name = "auto-commit"
 version = "0.1.0"
 edition = "2021"
+description = "A Rust CLI tool that analyzes git staged changes and generates conventional commit messages"
+authors = ["Auto Commit Contributors"]
 
 [dependencies]
 clap = { version = "4.4", features = ["derive"] }
-git2 = "0.18"
 dialoguer = "0.11"
 anyhow = "1.0"
 colored = "2.1"
+
+[dev-dependencies]
+
+[profile.release]
+opt-level = 3
+lto = true