Initial commit: Vultr API v2 Python wrapper with FastAPI server

- vultr_api/: Python library wrapping Vultr API v2
  - 17 resource modules (instances, dns, firewall, vpc, etc.)
  - Pagination support, error handling

- server/: FastAPI REST server
  - All API endpoints exposed via HTTP
  - X-API-Key header authentication
  - Swagger docs at /docs

- Podman quadlet config for systemd deployment

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

server/routers/os_api.py

@@ -0,0 +1,24 @@
+"""Operating Systems router"""
+from fastapi import APIRouter, Depends, Query
+from typing import Optional
+
+from vultr_api import VultrClient
+from deps import get_client
+
+router = APIRouter()
+
+
+@router.get("")
+async def list_os(
+    per_page: int = Query(25, le=500),
+    cursor: Optional[str] = None,
+    client: VultrClient = Depends(get_client)
+):
+    """List all operating systems"""
+    return client.os.list(per_page=per_page, cursor=cursor)
+
+
+@router.get("/all")
+async def list_all_os(client: VultrClient = Depends(get_client)):
+    """List all operating systems (auto-paginated)"""
+    return {"os": client.os.list_all()}