Add Windows agent installer, fix Linux install URL

- install-windows.ps1: one-liner PowerShell installs Python, pywin32,
  downloads agent, creates config, installs Windows Service (auto-start)
- install.sh: fix JARVIS_URL from hardcoded LAN IP to https://jarvis.orbishosting.com
- install.sh: fix ssl_verify default to true for external agents

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

public_html/agent/install.sh

@@ -9,7 +9,7 @@ set -e
 
 HOSTNAME_ARG="${1:-$(hostname -s)}"
 AGENT_TYPE="${2:-linux}"
-JARVIS_URL="http://10.48.200.211"
+JARVIS_URL="${JARVIS_URL:-https://jarvis.orbishosting.com}"
 JARVIS_HOST=""
 INSTALL_DIR="/opt/jarvis-agent"
 CONFIG_DIR="/etc/jarvis-agent"
@@ -50,7 +50,7 @@ else
 {
   "jarvis_url": "$JARVIS_URL",
   "host_header": "$JARVIS_HOST",
-  "ssl_verify": false,
+  "ssl_verify": true,
   "registration_key": "$REG_KEY",
   "hostname": "$HOSTNAME_ARG",
   "agent_type": "$AGENT_TYPE",