chore: add sproutclaw git workflow and track local extensions

Document main/upstream-sync/feature branch strategy, add sync/push
scripts, track .pi/agent extensions and webui in git, and disable
startup changelog via showChangelogOnStartup.

Co-authored-by: Cursor <cursoragent@cursor.com>

.pi/agent/extensions/webui/frontend/vite.config.ts

@@ -0,0 +1,65 @@
+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vite";
+import { VitePWA } from "vite-plugin-pwa";
+
+export default defineConfig({
+	plugins: [
+		react(),
+		VitePWA({
+			registerType: "prompt",
+			includeAssets: ["logo.png", "logo192.png", "logo512.png"],
+			manifest: {
+				name: "萌小芽",
+				short_name: "萌小芽",
+				description: "树萌芽智能 AI 助手 Web 客户端",
+				theme_color: "#f7f8fb",
+				background_color: "#f7f8fb",
+				display: "standalone",
+				orientation: "portrait-primary",
+				scope: "/",
+				start_url: "/",
+				lang: "zh-CN",
+				icons: [
+					{
+						src: "logo192.png",
+						sizes: "192x192",
+						type: "image/png",
+					},
+					{
+						src: "logo512.png",
+						sizes: "512x512",
+						type: "image/png",
+					},
+					{
+						src: "logo512.png",
+						sizes: "512x512",
+						type: "image/png",
+						purpose: "maskable",
+					},
+				],
+			},
+			workbox: {
+				navigateFallback: "index.html",
+				globPatterns: ["**/*.{js,css,html,png,ico,woff2}"],
+				runtimeCaching: [
+					{
+						urlPattern: /^\/api\//,
+						handler: "NetworkOnly",
+					},
+				],
+			},
+			devOptions: {
+				enabled: false,
+			},
+		}),
+	],
+	build: {
+		outDir: "../dist",
+		emptyOutDir: true,
+	},
+	server: {
+		proxy: {
+			"/api": "http://localhost:19133",
+		},
+	},
+});