feat: add subpackage support and update version file path

- Introduces `subpackage` field in copier.yaml with help text and default value
- Updates version file path in pyproject.toml.jinja to use subpackage
- Renames template source directories from `{{ name }}` to `{{ subpackage }}`

Author: liblaf

copier.yaml

@@ -72,5 +72,10 @@ name:
 
 package:
   type: str
-  help: TODO
+  help: "package (example: liblaf)"
+  default: "{{ name }}"
+
+subpackage:
+  type: str
+  help: "sub-package (example: liblaf/grapes)"
   default: "{{ name }}"

template/pyproject.toml.jinja

@@ -60,7 +60,7 @@ branch = true
 source = ["src/"]
 
 [tool.hatch.build.hooks.vcs]
-version-file = "src/{{ package }}/_version.py"
+version-file = "src/{{ subpackage }}/_version.py"
 
 [tool.hatch.build.targets.sdist]
 only-include = ["src/"]