Fix setuptools package discovery error during cloud provider dependency installation

The issue occurred when uv tried to install optional dependencies (e.g., [digitalocean])
because setuptools was auto-discovering directories like 'roles', 'library', etc. as
Python packages. Since Algo is an Ansible project, not a Python package, this caused
builds to fail.

Added explicit build-system configuration to pyproject.toml with py-modules = [] to
disable package discovery entirely.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

pyproject.toml

@@ -1,3 +1,7 @@
+[build-system]
+requires = ["setuptools>=68.0.0"]
+build-backend = "setuptools.build_meta"
+
 [project]
 name = "algo"
 description = "Set up a personal IPSEC VPN in the cloud"
@@ -12,6 +16,10 @@ dependencies = [
     "segno>=1.6.0",
 ]
 
+[tool.setuptools]
+# Explicitly disable package discovery since Algo is not a Python package
+py-modules = []
+
 [project.optional-dependencies]
 # Cloud provider dependencies (installed automatically based on provider selection)
 aws = [

uv.lock

@@ -20,7 +20,7 @@ wheels = [
 [[package]]
 name = "algo"
 version = "2.0.0b0"
-source = { virtual = "." }
+source = { editable = "." }
 dependencies = [
     { name = "ansible" },
     { name = "jinja2" },