Add DECK Frontend - Vite + TypeScript migration

- Migrated vanilla JS frontend to Vite + TypeScript
- Modular architecture: views, components, utils, api, state
- Three-panel layout: libraries (left), content (center), detail (right)
- Group name resolution via hstTags (set_hst -> readable name)
- Name priority: name_es -> alias -> ref -> hash truncated
- D3.js lazy loading in GraphView
- Hash-based routing
- Deployed to tzzrdeck.me

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

hst-frontend-new/src/api/client.ts

@@ -0,0 +1,38 @@
+import { API_BASE } from '@/config/index.ts';
+
+interface FetchOptions {
+  method?: 'GET' | 'POST';
+  body?: Record<string, unknown>;
+}
+
+export async function apiClient<T>(
+  endpoint: string,
+  options: FetchOptions = {}
+): Promise<T> {
+  const { method = 'GET', body } = options;
+
+  const config: RequestInit = {
+    method,
+    headers: body ? { 'Content-Type': 'application/json' } : undefined,
+    body: body ? JSON.stringify(body) : undefined,
+  };
+
+  const response = await fetch(`${API_BASE}${endpoint}`, config);
+  if (!response.ok) {
+    throw new Error(`API Error: ${response.status}`);
+  }
+  return response.json();
+}
+
+export async function apiClientSafe<T>(
+  endpoint: string,
+  options: FetchOptions = {},
+  fallback: T
+): Promise<T> {
+  try {
+    return await apiClient<T>(endpoint, options);
+  } catch {
+    console.error(`API call failed: ${endpoint}`);
+    return fallback;
+  }
+}