feat(packaging): add desktop entry for PicoClaw Launcher

- Add .desktop file with Terminal=true, named "PicoClaw Launcher"
- Install to /usr/share/applications/ for app menu visibility
- Add 512x512 PNG icon to /usr/share/icons/hicolor/

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

.goreleaser.yaml

@@ -149,6 +149,11 @@ nfpms:
       - rpm
       - deb
     bindir: /usr/bin
+    contents:
+      - src: web/picoclaw-launcher.desktop
+        dst: /usr/share/applications/picoclaw-launcher.desktop
+      - src: web/picoclaw-launcher.png
+        dst: /usr/share/icons/hicolor/512x512/apps/picoclaw-launcher.png
 
 changelog:
   sort: asc

web/picoclaw-launcher.desktop

@@ -0,0 +1,9 @@
+[Desktop Entry]
+Name=PicoClaw Launcher
+Comment=Web-based configuration and management UI for PicoClaw
+Exec=picoclaw-launcher
+Icon=picoclaw-launcher
+Terminal=true
+Type=Application
+Categories=Utility;Network;
+Keywords=picoclaw;ai;agent;bot;