feat: scaffold conky_widget desktop monitor

Conky (X11 + Lua + Cairo) desktop widget with three clickable tabs
(Red / Sistema / Docker) rendered entirely with Cairo:

- Red: live down/up speed for enp5s0, 60s history graph, active
  connections count, totals, and launcher buttons for Wireshark,
  ntopng and nethogs (with notify-send fallback when missing).
- Sistema: total CPU + per-core bars, RAM, swap, root disk usage,
  temperature, load average and uptime.
- Docker: running/total container count and active container names
  (read without sudo).

Includes install.sh (symlink into ~/.config/conky + XFCE autostart),
launch.sh (tool launcher with missing-binary fallback) and app.md
with e2e_checks. Positioned top-right of the primary monitor
(xinerama_head 0), configurable.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,27 @@
+# conky_widget
+
+Widget de escritorio Conky con tres pestañas clickeables para monitorizar el PC
+en vivo y lanzar herramientas de análisis de red.
+
+![tabs](Red · Sistema · Docker)
+
+## Arranque rápido
+
+```bash
+./install.sh
+conky -c ~/.config/conky/conky_widget/conky.conf &
+```
+
+## Estructura
+
+```
+conky_widget/
+  conky.conf        # ventana, posición, carga de Lua
+  lua/
+    widget.lua      # render Cairo de las pestañas + hook de clics
+    launch.sh       # lanza apps con fallback a notify-send
+  install.sh        # symlink en ~/.config/conky + autostart XFCE
+  app.md            # frontmatter de registro
+```
+
+Ver `app.md` para detalle de pestañas, configuración y requisitos.