scripts: add create-host tool for automated host configuration generation

Implements Phase 2 of the automated deployment pipeline.

This commit adds a Python CLI tool that automates the creation of NixOS host
configurations, eliminating manual boilerplate and reducing errors.

Features:
- Python CLI using typer framework with rich terminal UI
- Comprehensive validation (hostname format/uniqueness, IP subnet/uniqueness)
- Jinja2 templates for NixOS configurations
- Automatic updates to flake.nix and terraform/vms.tf
- Support for both static IP and DHCP configurations
- Dry-run mode for safe previews
- Packaged as Nix derivation and added to devShell

Usage:
  create-host --hostname myhost --ip 10.69.13.50/24

The tool generates:
- hosts/<hostname>/default.nix
- hosts/<hostname>/configuration.nix
- Updates flake.nix with new nixosConfigurations entry
- Updates terraform/vms.tf with new VM definition

All generated configurations include full system imports (monitoring, SOPS,
autoupgrade, etc.) and are validated with nix flake check and tofu validate.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

scripts/create-host/setup.py

@@ -0,0 +1,33 @@
+from setuptools import setup
+from pathlib import Path
+
+# Read templates
+templates = [str(p.relative_to(".")) for p in Path("templates").glob("*.j2")]
+
+setup(
+    name="create-host",
+    version="0.1.0",
+    description="NixOS host configuration generator for homelab infrastructure",
+    py_modules=[
+        "create_host",
+        "models",
+        "validators",
+        "generators",
+        "manipulators",
+    ],
+    include_package_data=True,
+    data_files=[
+        ("templates", templates),
+    ],
+    install_requires=[
+        "typer",
+        "jinja2",
+        "rich",
+    ],
+    entry_points={
+        "console_scripts": [
+            "create-host=create_host:app",
+        ],
+    },
+    python_requires=">=3.9",
+)