init: media-center v2

Rewrite of ESH-Media v1 with separated main/renderer/shared architecture
(vite-plugin-electron, React 18, react-router-dom). Includes NeDB storage,
electron-store config, proxy manager with FoxyProxy/uBlock extensions,
custom server-checked updater, NSIS installer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/renderer/styles/SiteCard.css

@@ -0,0 +1,63 @@
+.site-card {
+  background-color: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 1.5rem;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.site-card:hover {
+  transform: translateY(-4px);
+  box-shadow: 0 4px 12px var(--shadow);
+  border-color: var(--accent);
+}
+
+.site-card-header {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  margin-bottom: 1rem;
+}
+
+.site-logo {
+  width: 32px;
+  height: 32px;
+  border-radius: 4px;
+}
+
+.site-name {
+  font-size: 1.2rem;
+  font-weight: 500;
+  margin: 0;
+}
+
+.site-url {
+  color: var(--text-secondary);
+  font-size: 0.9rem;
+  margin: 0 0 1rem 0;
+  word-break: break-all;
+}
+
+.site-badges {
+  display: flex;
+  gap: 0.5rem;
+  flex-wrap: wrap;
+}
+
+.badge {
+  padding: 0.25rem 0.75rem;
+  border-radius: 12px;
+  font-size: 0.8rem;
+  font-weight: 500;
+}
+
+.proxy-badge {
+  background-color: rgba(74, 158, 255, 0.2);
+  color: var(--accent);
+}
+
+.enabled-badge {
+  background-color: rgba(76, 175, 80, 0.2);
+  color: var(--success);
+}