T1/Phase 1: scaffold Vite SPA + Hono API + Bun worker

- apps/web: Vite + React 19 + TanStack Router/Query + shadcn/ui
   - apps/api: Hono + Bun on :3001 with /api/health, /api/auth/*, /mcp stubs
   - apps/worker: Bun worker stub, DB connection, graceful SIGTERM
   - apps/web-legacy/: old Next.js code moved aside (preserved for T2-T8 reference)
   - Dockerfiles: api (Bun), worker (Bun), spa (multi-stage Caddy)
   - Caddyfile: serves dist + reverse-proxies /api/* + /mcp to api
   - docker-compose.yml: 4-service target (api, spa, db, worker)
   - packages/db/src/client.ts: shared Drizzle client for api + worker
   - db/client.ts: root-level alias for convenience

   Parent: t_e1cbd87d -> t_24c9c3fd (T0)

apps/web-legacy/lib/stores/use-create-dialog-store.ts

@@ -0,0 +1,17 @@
+import { create } from "zustand";
+
+type ItemType = "task" | "project" | "habit" | null;
+
+interface CreateDialogState {
+  type: ItemType;
+  open: boolean;
+  openCreate: (type: ItemType) => void;
+  closeCreate: () => void;
+}
+
+export const useCreateDialogStore = create<CreateDialogState>((set) => ({
+  type: null,
+  open: false,
+  openCreate: (type: ItemType) => set({ type, open: true }),
+  closeCreate: () => set({ type: null, open: false }),
+}));