refactor: rename package from mytoolkit to bin

- Move all source files from mytoolkit/ to bin/
- Update entry point and build config in pyproject.toml
- Add pillow and pypdf dependencies
- Update README and .gitignore paths
- Remove unused subprocess import in pdf.py
- Clean up duplicate imports in pdf merge command

pyproject.toml

@@ -5,10 +5,15 @@ description = "Personal CLI toolkit"
 requires-python = ">=3.9"
 dependencies = [
     "click>=8.0",
+    "pillow>=11.3.0",
+    "pypdf>=6.10.1",
 ]
 
 [project.scripts]
-mytoolkit = "mytoolkit.cli:main"
+mytoolkit = "bin.cli:main"
+
+[tool.hatch.build.targets.wheel]
+packages = ["bin"]
 
 [build-system]
 requires = ["hatchling"]