fix(installer): send correct Host header in Traefik routing check

The root redirect rule matches Host(`PUBLIC_HOST`), not localhost.
Curl with --resolve (bash) and Host header (PS1) so the health
check sends the right hostname when verifying Traefik routing.

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

installer/install.sh

@@ -885,8 +885,10 @@ wait_for_docker_healthy() {
 }
 
 check_endpoint() {
-  local name="$1" url="$2" timeout_secs="${3:-120}"
+  local name="$1" url="$2" timeout_secs="${3:-120}" resolve="${4:-}"
   local start_time=$(date +%s)
+  local extra_flags=""
+  [ -n "$resolve" ] && extra_flags="--resolve $resolve"
 
   while true; do
     local elapsed=$(( $(date +%s) - start_time ))
@@ -894,7 +896,7 @@ check_endpoint() {
       printf "  ${RED}[FAIL]${NC} %-20s not reachable after %ds\n" "$name" "$timeout_secs"
       return 1
     fi
-    if curl -sfk -o /dev/null "$url" 2>/dev/null; then
+    if curl -sfk $extra_flags -o /dev/null "$url" 2>/dev/null; then
       local duration=$(( $(date +%s) - start_time ))
       printf "  ${GREEN}[ok]${NC} %-20s ready (%ds)\n" "$name" "$duration"
       return 0
@@ -927,7 +929,7 @@ verify_health() {
       check_endpoint "Cameleer SaaS" "https://localhost:${HTTPS_PORT}/platform/api/config" 120 || failed=1
 
     [ $failed -eq 0 ] && \
-      check_endpoint "Traefik routing" "https://localhost:${HTTPS_PORT}/" 30 || failed=1
+      check_endpoint "Traefik routing" "https://${PUBLIC_HOST}:${HTTPS_PORT}/" 30 "${PUBLIC_HOST}:${HTTPS_PORT}:127.0.0.1" || failed=1
   fi
 
   echo ""