feat: add cluster update/delete endpoints, expand tcp/udp protocol handling, and enhance cluster management UI

Add PATCH /clusters/{cluster_id} endpoint with optional token update and audit logging, implement DELETE /clusters/{cluster_id} with cascading deletion of nodes, workloads, networks, subnets, and IP addresses, expand firewall rule generation to split tcp/udp protocol into separate tcp and udp rules for Proxmox compatibility, add ClusterUpdate schema with optional api_token field, include

backend/app/schemas/domain.py

@@ -71,6 +71,15 @@ class ClusterCreate(BaseModel):
     verify_tls: bool = True
 
 
+class ClusterUpdate(BaseModel):
+    name: str
+    api_url: str
+    api_token: str | None = Field(default=None, min_length=8)
+    provider: str = "proxmox"
+    mode: str = "read_only"
+    verify_tls: bool = True
+
+
 class TenantCreate(BaseModel):
     name: str
     description: str | None = None
@@ -157,6 +166,7 @@ class ClusterRead(OrmModel):
     api_url: str
     provider: str
     mode: str
+    verify_tls: bool
     last_sync_at: datetime | None
     last_sync_status: str | None
     last_sync_error: str | None