Add initial project structure with essential files

- Created .gitignore to exclude build artifacts and dependencies.
- Added index.html as the main entry point for the application.
- Included LICENSE file with Apache 2.0 terms.
- Initialized package.json and package-lock.json for project dependencies.
- Added pnpm-lock.yaml for package management.
- Created QUICKSTART.md for setup instructions.
- Added README.md and README.zh-CN.md for project documentation in English and Chinese.

src/state/config.ts

@@ -0,0 +1,29 @@
+import type { AppConfig } from '../types';
+
+const STORAGE_KEY = 'open-claude-design:config';
+
+export const DEFAULT_CONFIG: AppConfig = {
+  mode: 'daemon',
+  apiKey: '',
+  baseUrl: 'https://api.anthropic.com',
+  model: 'claude-sonnet-4-5',
+  agentId: null,
+  skillId: null,
+  designSystemId: null,
+  onboardingCompleted: false,
+};
+
+export function loadConfig(): AppConfig {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (!raw) return { ...DEFAULT_CONFIG };
+    const parsed = JSON.parse(raw) as Partial<AppConfig>;
+    return { ...DEFAULT_CONFIG, ...parsed };
+  } catch {
+    return { ...DEFAULT_CONFIG };
+  }
+}
+
+export function saveConfig(config: AppConfig): void {
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(config));
+}