✨ tests: revert to docker provider + bump versions + add 6 scenarios

Reverts the stream-mode scenario to the Traefik docker provider (the
file provider was a workaround for a local docker daemon API version
mismatch, irrelevant in CI). Bumps Traefik to v3.7.1 and Crowdsec to
v1.7.8 across all scenarios.

Adds six new E2E scenarios:
- live-mode: short defaultDecisionSeconds, verifies cache-then-recheck
- none-mode: verifies LAPI is queried per request, no caching
- trusted-ips: clientTrustedIPs bypass even when the trusted IP is banned
- custom-ban-page: BanHTMLFilePath body + Content-Type validation
- captcha: captcha decision serves the captcha page (HTTP 200)
- appsec: SQLi probe blocked by appsec-virtual-patching

Each scenario uses an isolated compose project, mounts the repo as a
local plugin, and asserts behavior via curl. Workflow matrix and
Makefile E2E_SCENARIOS updated accordingly.

Refs #328

tests/e2e/scenarios/custom-ban-page/run.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+# shellcheck source=../../lib/common.sh
+source "$HERE/../../lib/common.sh"
+
+SCENARIO=custom-ban-page
+PROJECT="e2e-${SCENARIO}"
+COMPOSE_FILE="$HERE/docker-compose.yml"
+LOG_FILE="/tmp/e2e-${SCENARIO}.log"
+
+cleanup() {
+  local rc=$?
+  if (( rc != 0 )); then
+    dump_diagnostics "$PROJECT" "$COMPOSE_FILE" > "$LOG_FILE" 2>&1 || true
+    echo "Scenario failed. Logs written to $LOG_FILE"
+  fi
+  docker compose -p "$PROJECT" -f "$COMPOSE_FILE" down -v --remove-orphans >/dev/null 2>&1 || true
+  exit $rc
+}
+trap cleanup EXIT
+
+echo "[$SCENARIO] starting stack..."
+docker compose -p "$PROJECT" -f "$COMPOSE_FILE" up -d --wait
+
+echo "[$SCENARIO] waiting for crowdsec readiness..."
+wait_crowdsec_ready
+
+echo "[$SCENARIO] waiting for traefik readiness..."
+wait_for_status http://localhost:8000/foo 200 30
+
+echo "[$SCENARIO] adding ban decision"
+docker exec crowdsec cscli decisions add --ip 1.2.3.4 --type ban --duration 5m
+
+echo "[$SCENARIO] waiting one stream tick + buffer..."
+sleep 6
+
+echo "[$SCENARIO] banned response status is 403"
+assert_status http://localhost:8000/foo 403 -H "X-Forwarded-For: 1.2.3.4"
+
+echo "[$SCENARIO] banned response Content-Type is HTML"
+assert_header http://localhost:8000/foo Content-Type "text/html; charset=utf-8" -H "X-Forwarded-For: 1.2.3.4"
+
+echo "[$SCENARIO] banned response body contains the custom marker"
+body=$(curl -s http://localhost:8000/foo -H "X-Forwarded-For: 1.2.3.4")
+if ! grep -q "E2E_CUSTOM_BAN_PAGE_MARKER" <<<"$body"; then
+  echo "Expected response body to contain E2E_CUSTOM_BAN_PAGE_MARKER, got:" >&2
+  echo "$body" >&2
+  exit 1
+fi
+
+echo "[$SCENARIO] OK"