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/deps.py

@@ -0,0 +1,20 @@
+"""Dependencies for FastAPI"""
+import os
+from fastapi import HTTPException, Security
+from fastapi.security import APIKeyHeader
+
+from vultr_api import VultrClient
+
+API_KEY_HEADER = APIKeyHeader(name="X-API-Key", auto_error=False)
+VULTR_API_KEY = os.environ.get("VULTR_API_KEY")
+
+
+def get_client(api_key: str = Security(API_KEY_HEADER)) -> VultrClient:
+    """Get VultrClient instance with API key from header or environment"""
+    key = api_key or VULTR_API_KEY
+    if not key:
+        raise HTTPException(
+            status_code=401,
+            detail="API key required. Set X-API-Key header or VULTR_API_KEY env var"
+        )
+    return VultrClient(api_key=key)