fix: rename wireshark CLI to gns3-wireshark to avoid conflict

The wireshark CLI entry point creates /usr/bin/wireshark which conflicts
with the system wireshark package on Arch Linux (owned by wireshark-qt),
causing package installation to fail.

Rename to gns3-wireshark to follow the same naming convention as other
GNS3 CLI tools (gns3server, gns3vmnet).

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

gns3server/agent/web_wireshark/WEB_WIRESHARK.md

@@ -10,7 +10,7 @@ This document describes how to manage GNS3 Web Wireshark containers using the ma
 Before using Web Wireshark, you need to set up the Docker image:
 
 ```bash
-pip install . && gns3-wireshark-setup
+pip install . && gns3-wireshark
 ```
 
 This will:

gns3server/agent/web_wireshark/setup_wireshark_image.py

@@ -20,7 +20,7 @@
 Setup Web Wireshark Docker image.
 
 This script pulls or builds the gns3/web-wireshark Docker image.
-Run with: pip install gns3server[wireshark] && gns3-wireshark-setup
+Run with: pip install gns3server && gns3-wireshark
 """
 
 import os