fix(integration): migrate wget-style curl syntax for Debian compatibility

After migrating base image from Alpine to Debian Trixie (PR #550),
integration test scripts were using wget-style options with curl
that don't work correctly on Debian.

Changed curl -q -O- (wget syntax) to curl -sf (proper curl):

waf_integration.sh
cerberus_integration.sh
rate_limit_integration.sh
crowdsec_startup_test.sh
install-go-1.25.5.sh
Also added future phase to plan for Playwright security test helpers
to prevent ACL deadlock issues during E2E testing.

Refs: #550

scripts/install-go-1.25.5.sh

@@ -15,7 +15,7 @@ TMPFILE="/tmp/${TARFILE}"
 # Download
 if [ ! -f "$TMPFILE" ]; then
   echo "Downloading go${GO_VERSION}..."
-  curl -q -O "$TMPFILE" "https://go.dev/dl/${TARFILE}"
+  curl -sSfL -o "$TMPFILE" "https://go.dev/dl/${TARFILE}"
 fi
 
 # Remove existing installation