feat(create): scaffold repositories via templates with preview and mirror setup

https://chatgpt.com/share/693f5bdb-1780-800f-a772-0ecf399627fc

templates/default/.gitignore.j2

@@ -0,0 +1,5 @@
+.venv/
+dist/
+build/
+__pycache__/
+*.pyc

templates/default/LICENSE.j2

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+{{ license_text }}

templates/default/README.md.j2

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+# {{ repository }}
+
+Homepage: {{ homepage }}
+
+## Author
+{{ author_name }} <{{ author_email }}>

templates/default/flake.nix.j2

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+{
+  description = "{{ repository }}";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  outputs = { self, nixpkgs }:
+  let system = "x86_64-linux"; pkgs = import nixpkgs { inherit system; };
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      packages = with pkgs; [ python312 python312Packages.pytest python312Packages.ruff ];
+    };
+  };
+}

templates/default/pyproject.toml.j2

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+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "{{ repository }}"
+version = "0.1.0"
+description = ""
+readme = "README.md"
+requires-python = ">=3.10"
+authors = [{ name = "{{ author_name }}", email = "{{ author_email }}" }]
+license = { text = "{{ license_text }}" }
+urls = { Homepage = "{{ homepage }}" }
+
+dependencies = []
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]