feat: add XDG autostart support for automatic application launching

feat: implement demo mode for automated feature showcase
feat: add XEmbed system tray protocol for external application icons
feat: add window snapping to left and right halves
feat: add minimize/restore toggle with Alt+F9 keybinding
docs: update README with new features and configuration details
build: update build system for new autostart and demo modules

site/architecture.html

@@ -26,6 +26,7 @@
                         <a href="configuration.html">Configuration</a>
                         <a href="ai-features.html">AI Features</a>
                         <a href="architecture.html">Architecture</a>
+                        <a href="design-patterns.html">Design Patterns</a>
                     </div>
                 </li>
                 <li><a href="https://retoor.molodetz.nl/retoor/dwn">Git</a></li>
@@ -62,7 +63,7 @@
                             <div style="color: var(--text-muted);">Lines of Code</div>
                         </div>
                         <div>
-                            <div style="font-size: 2rem; font-weight: 700; color: var(--primary);">12</div>
+                            <div style="font-size: 2rem; font-weight: 700; color: var(--primary);">13</div>
                             <div style="color: var(--text-muted);">Core Modules</div>
                         </div>
                         <div>
@@ -170,6 +171,11 @@
                                 <td><code>ai.c</code></td>
                                 <td>Async OpenRouter API integration, Exa semantic search</td>
                             </tr>
+                            <tr>
+                                <td><strong>Autostart</strong></td>
+                                <td><code>autostart.c</code></td>
+                                <td>XDG Autostart support, .desktop file parsing, concurrent app launch</td>
+                            </tr>
                             <tr>
                                 <td><strong>Util</strong></td>
                                 <td><code>util.c</code></td>
@@ -196,6 +202,8 @@
     │   └── config.c
     ├── notifications.c (independent)
     ├── ai.c (independent)
+    ├── autostart.c
+    │   └── config.c
     └── keys.c
         └── config.c</code></pre>
                 </div>
@@ -490,6 +498,7 @@ extern DWNState *dwn;  // Global singleton</code></pre>
                         <li><a href="shortcuts.html">Keyboard Shortcuts</a></li>
                         <li><a href="configuration.html">Configuration</a></li>
                         <li><a href="architecture.html">Architecture</a></li>
+                        <li><a href="design-patterns.html">Design Patterns</a></li>
                     </ul>
                 </div>
                 <div class="footer-section">