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

ModeTemplate/backend/server.ts

@@ -0,0 +1,72 @@
+/**
+ * Backend Server
+ * 
+ * Hono API server with auth routes pre-configured.
+ */
+
+import { Hono } from 'hono';
+import { cors } from 'hono/cors';
+import { getAuthUrl, handleCallback, getConfigFromEnv } from './modules/auth';
+
+const app = new Hono();
+
+// CORS for frontend
+app.use('/*', cors({
+  origin: ['http://localhost:5173', 'http://localhost:3005'],
+  credentials: true,
+}));
+
+// Health check
+app.get('/health', (c) => c.json({ status: 'ok' }));
+
+// ============================================
+// AUTH ROUTES
+// ============================================
+
+const authConfig = getConfigFromEnv();
+
+app.get('/auth/login', (c) => {
+  return c.redirect(getAuthUrl(authConfig));
+});
+
+app.get('/auth/callback', async (c) => {
+  const code = c.req.query('code');
+  
+  if (!code) {
+    return c.json({ error: 'No authorization code' }, 400);
+  }
+
+  try {
+    const result = await handleCallback(code, authConfig);
+    
+    // Return token and user info
+    // Frontend should store token and redirect
+    return c.json(result);
+  } catch (err) {
+    const message = err instanceof Error ? err.message : 'Auth failed';
+    return c.json({ error: message }, 403);
+  }
+});
+
+// ============================================
+// API ROUTES
+// ============================================
+
+app.get('/api/me', async (c) => {
+  // TODO: Validate token from Authorization header
+  // Return current user info
+  return c.json({ message: 'Implement me' });
+});
+
+// ============================================
+// START SERVER
+// ============================================
+
+const port = Number(process.env.PORT) || 3005;
+
+console.log(`[Server] Starting on port ${port}...`);
+
+export default {
+  port,
+  fetch: app.fetch,
+};