Add React UI with Vite

Dashboard, agents, goals, issues, and projects pages with sidebar
navigation. API client layer, custom hooks, and shared layout
components. Built with Vite and TypeScript.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/api/agents.ts

@@ -0,0 +1,10 @@
+import type { Agent } from "@paperclip/shared";
+import { api } from "./client";
+
+export const agentsApi = {
+  list: () => api.get<Agent[]>("/agents"),
+  get: (id: string) => api.get<Agent>(`/agents/${id}`),
+  create: (data: Partial<Agent>) => api.post<Agent>("/agents", data),
+  update: (id: string, data: Partial<Agent>) => api.patch<Agent>(`/agents/${id}`, data),
+  remove: (id: string) => api.delete<Agent>(`/agents/${id}`),
+};