Add ModeTemplate with Svelte 5 frontend and components

- Create reusable components: auth, api-client, shared-types
- ModeTemplate with Hono backend and SvelteKit frontend
- Auth store refactored to class-based Svelte 5 pattern
- SSR-safe hydrate() pattern for localStorage access
- Frontend builds successfully with Svelte 5 runes

components/api-client/README.md

@@ -0,0 +1,59 @@
+# API Client Component
+
+Frontend helper for making authenticated requests to the backend.
+
+## Usage
+
+```typescript
+import { createApiClient } from './components/api-client';
+import { STORAGE_KEYS } from './components/auth';
+
+// Create client with token getter
+const api = createApiClient({
+  baseUrl: '/api',  // or 'http://localhost:3005/api'
+  getToken: () => localStorage.getItem(STORAGE_KEYS.PB_TOKEN),
+});
+
+// Make requests
+const result = await api.get<User[]>('/users');
+
+if (result.ok) {
+  console.log(result.data);  // User[]
+} else {
+  console.error(result.error);  // Error message
+}
+
+// POST with body
+const created = await api.post<Job>('/jobs', {
+  title: 'New Job',
+  status: 'open',
+});
+```
+
+## Methods
+
+- `api.get<T>(path)` - GET request
+- `api.post<T>(path, body?)` - POST request
+- `api.put<T>(path, body?)` - PUT request
+- `api.patch<T>(path, body?)` - PATCH request
+- `api.delete<T>(path)` - DELETE request
+
+## Response Type
+
+```typescript
+interface ApiResponse<T> {
+  ok: boolean;      // true if status 2xx
+  status: number;   // HTTP status code
+  data?: T;         // Response data (if ok)
+  error?: string;   // Error message (if not ok)
+}
+```
+
+## Copying to a Mode
+
+1. Copy `components/api-client/` to your mode's `frontend/lib/api-client/`
+2. Update imports
+
+## Dependencies
+
+None - fully self-contained. No package.json needed - inherits from consuming project.