fix: storage pool list now filters by content type — only pools with 'images' support are shown

backend/app.py

@@ -96,7 +96,7 @@ def health() -> HealthResponse:
 
 @app.get(f"{API_PREFIX}/storage/pools")
 def storage_pools():
-    """Return available Proxmox storage pools that support disk images."""
+    """Return available Proxmox storage pools that support VM disk images."""
     pools = []
     try:
         cfg = Path("/etc/pve/storage.cfg")
@@ -126,10 +126,12 @@ def storage_pools():
     result = []
     for p in pools:
         if p.get("type") in ("lvmthin", "zfspool", "rbd", "dir"):
-            result.append({
-                "name": p["name"],
-                "type": p["type"],
-            })
+            content = p.get("content", "")
+            if "images" in content:
+                result.append({
+                    "name": p["name"],
+                    "type": p["type"],
+                })
 
     if not result:
         result.append({"name": "local-lvm", "type": "lvmthin"})