feat: route commands for peer clients (Linux/Windows) + footer signature

- scripts page: new card with Linux/macOS and Windows route commands
  per peer that has advertised_routes, with OS tab switcher and copy buttons
- Made by Galyaviev moved from sidebar to bottom-center page footer on all pages
- page-footer style: Dancing Script 20px, clickable mailto:ruslan@ipcom.su

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gui/static/style.css

@@ -103,24 +103,25 @@ body {
 
 .logout-btn:hover { background: #fee2e2; color: #dc2626; }
 
-.made-by {
-  font-family: 'Dancing Script', cursive;
-  font-size: 18px;
-  color: #b0b8cc;
+.page-footer {
   text-align: center;
-  padding: 8px 0 4px;
+  padding: 18px 32px 24px;
+  font-family: 'Dancing Script', cursive;
+  font-size: 20px;
+  color: #c4cad8;
   letter-spacing: 0.02em;
 }
 
-.made-by a {
+.page-footer a {
   color: inherit;
   text-decoration: none;
+  transition: color 0.15s;
 }
 
-.made-by a:hover { color: var(--accent); }
+.page-footer a:hover { color: var(--accent); }
 
 /* ─── Layout ────────────────────────────────────────────────── */
-.layout { margin-left: var(--sidebar-w); flex: 1; display: flex; flex-direction: column; }
+.layout { margin-left: var(--sidebar-w); flex: 1; display: flex; flex-direction: column; min-height: 100vh; }
 main { padding: 28px 32px; flex: 1; max-width: 1400px; width: 100%; }
 
 /* ─── Page header ───────────────────────────────────────────── */