✨ 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

.github/workflows/e2e.yml

@@ -21,6 +21,12 @@ jobs:
       matrix:
         scenario:
           - stream-mode
+          - live-mode
+          - none-mode
+          - trusted-ips
+          - custom-ban-page
+          - captcha
+          - appsec
     steps:
       - uses: actions/checkout@v6
       - name: Run scenario