feat: add secure contract import CLI

pyproject.toml

@@ -13,6 +13,7 @@ authors = [{ name = "proxmox-api-simulator contributors" }]
 dependencies = [
   "asyncpg>=0.30,<0.31",
   "fastapi>=0.116,<0.117",
+  "httpx>=0.28,<0.29",
   "pydantic>=2.11,<3",
   "pydantic-settings>=2.10,<3",
   "uvicorn[standard]>=0.35,<0.36",
@@ -21,7 +22,6 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
   "hypothesis>=6.135,<7",
-  "httpx>=0.28,<0.29",
   "mypy>=1.17,<1.18",
   "pytest>=8.4,<9",
   "pytest-asyncio>=1.1,<2",
@@ -29,6 +29,9 @@ dev = [
   "ruff>=0.12,<0.13",
 ]
 
+[project.scripts]
+proxmox-api-contract = "app.contracts.cli:main"
+
 [tool.hatch.build.targets.wheel]
 packages = ["app"]