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>

install.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Instala conky_widget: enlaza la config en ~/.config/conky, registra el
+# autostart de XFCE y deja el widget listo para arrancar.
+#
+# Idempotente: se puede ejecutar varias veces sin efectos duplicados.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+CONKY_DIR="$HOME/.config/conky"
+LINK="$CONKY_DIR/conky_widget"
+AUTOSTART_DIR="$HOME/.config/autostart"
+DESKTOP="$AUTOSTART_DIR/conky_widget.desktop"
+CONF="$LINK/conky.conf"
+
+echo "==> conky_widget install"
+
+# 1. Comprobar dependencia
+if ! command -v conky >/dev/null 2>&1; then
+    echo "ERROR: conky no esta instalado. Instalar: sudo apt install conky-all" >&2
+    exit 1
+fi
+
+# 2. Enlazar la app dentro de ~/.config/conky (ruta estable para la config)
+mkdir -p "$CONKY_DIR"
+ln -sfn "$SCRIPT_DIR" "$LINK"
+echo "    symlink: $LINK -> $SCRIPT_DIR"
+
+# 3. Permisos de ejecucion para los scripts
+chmod +x "$SCRIPT_DIR/lua/launch.sh" "$SCRIPT_DIR/install.sh" 2>/dev/null || true
+
+# 4. Autostart de XFCE (espera 5s a que el compositor este listo)
+mkdir -p "$AUTOSTART_DIR"
+cat > "$DESKTOP" <<EOF
+[Desktop Entry]
+Type=Application
+Name=Conky Widget
+Comment=Visualizador de escritorio con pestañas (Red / Sistema / Docker)
+Exec=sh -c "sleep 5; exec conky -c '$CONF'"
+Terminal=false
+X-GNOME-Autostart-enabled=true
+EOF
+echo "    autostart: $DESKTOP"
+
+echo "==> Listo."
+echo "    Arrancar ahora:  conky -c '$CONF' &"
+echo "    Parar:           pkill -f conky_widget/conky.conf"
+echo "    Monitor:         editar xinerama_head en conky.conf (0=HDMI-0, 1=DP-1)"