fix: remove invalid servers { name edge } Caddyfile directive

`name` is not a valid subdirective of the global `servers` block in
Caddyfile syntax — Caddy would reject the config on startup. The
dynamic server discovery in `_discover_server_name()` already handles
routing to the correct server regardless of its auto-generated name.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tools/edge-control/install.sh

@@ -225,9 +225,9 @@ EOF
 chmod 600 "$GANDI_ENV"
 
 # Create Caddyfile with admin API and wildcard cert
-# The "servers" global option names the auto-generated server "edge" so that
-# lib/caddy.sh (which discovers the server dynamically) finds a predictable
-# name — defense-in-depth alongside the dynamic discovery in add_route.
+# Note: Caddy auto-generates server names (srv0, srv1, …). lib/caddy.sh
+# discovers the server name dynamically via _discover_server_name() so we
+# don't need to name the server here.
 CADDYFILE="/etc/caddy/Caddyfile"
 cat > "$CADDYFILE" <<'CADDYEOF'
 # Caddy configuration for edge control plane
@@ -235,9 +235,6 @@ cat > "$CADDYFILE" <<'CADDYEOF'
 
 {
   admin localhost:2019
-  servers {
-    name edge
-  }
 }
 
 # Default site (reverse proxy for edge tunnels will be added dynamically)