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/regions.py

@@ -0,0 +1,34 @@
+"""Regions 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_regions(
+    per_page: int = Query(25, le=500),
+    cursor: Optional[str] = None,
+    client: VultrClient = Depends(get_client)
+):
+    """List all regions"""
+    return client.regions.list(per_page=per_page, cursor=cursor)
+
+
+@router.get("/all")
+async def list_all_regions(client: VultrClient = Depends(get_client)):
+    """List all regions (auto-paginated)"""
+    return {"regions": client.regions.list_all()}
+
+
+@router.get("/{region_id}/availability")
+async def list_region_availability(
+    region_id: str,
+    plan_type: Optional[str] = None,  # vc2, vhf, vdc, etc.
+    client: VultrClient = Depends(get_client)
+):
+    """List available plans in a region"""
+    return client.regions.list_availability(region_id, plan_type=plan_type)