Initial commit: StackPilot Phase 1 (Core)

Self-hosted Docker Compose manager.
- Backend: FastAPI + docker-py + SQLite (JWT auth, file-first stacks,
  lifecycle, live status, WebSocket logs, docker-run converter, audit log)
- Frontend: React + Vite + Tailwind (login/setup, dashboard, stacks,
  stack detail, Monaco editor, dark/light theme)
- Deployment: docker-compose.yml, Dockerfiles, nginx reverse proxy

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/hooks/useStackActions.ts

@@ -0,0 +1,39 @@
+import { useState } from "react";
+import { useQueryClient } from "@tanstack/react-query";
+import { toast } from "sonner";
+import { stacksApi } from "@/api/stacks";
+import { apiErrorMessage } from "@/api/client";
+
+export function useStackActions() {
+  const qc = useQueryClient();
+  const [busyId, setBusyId] = useState<string | null>(null);
+
+  const run = async (
+    id: string,
+    label: string,
+    fn: (id: string) => Promise<unknown>
+  ) => {
+    setBusyId(id);
+    const t = toast.loading(`${label} ${id}…`);
+    try {
+      await fn(id);
+      toast.success(`${label} ${id} ✓`, { id: t });
+      qc.invalidateQueries({ queryKey: ["stacks"] });
+      qc.invalidateQueries({ queryKey: ["stack", id] });
+    } catch (err) {
+      toast.error(apiErrorMessage(err), { id: t });
+    } finally {
+      setBusyId(null);
+    }
+  };
+
+  return {
+    busyId,
+    start: (id: string) => run(id, "Starting", stacksApi.start),
+    stop: (id: string) => run(id, "Stopping", stacksApi.stop),
+    restart: (id: string) => run(id, "Restarting", stacksApi.restart),
+    pull: (id: string) => run(id, "Pulling", stacksApi.pull),
+    updateImages: (id: string) => run(id, "Updating", stacksApi.update_images),
+    down: (id: string) => run(id, "Tearing down", stacksApi.down),
+  };
+}