feat: finish the host-metrics plugin, move host status into core (B16)

plugins/file-manager/src/frontend/disk-info.ts

@@ -0,0 +1,22 @@
+/** One mounted filesystem, as the host-metrics plugin reports it. */
+export interface DiskFilesystem {
+  filesystem: string;
+  type: string;
+  mount: string;
+  percent: number | null;
+  usedHuman: string | null;
+  totalHuman: string | null;
+  availableHuman: string | null;
+  usedBytes: number | null;
+  totalBytes: number | null;
+  availableBytes: number | null;
+  label?: string;
+}
+
+export interface HostDiskInfo {
+  percent: number | null;
+  usedHuman: string | null;
+  totalHuman: string | null;
+  mount: string | null;
+  filesystems?: DiskFilesystem[];
+}