fix: stop the end-to-end suite failing on its own transport check

The device routes were given a rule refusing unencrypted requests unless
DEVICE_ALLOW_HTTP says otherwise. The test harness serves plain http on
localhost, so /api/display started answering 403 and "changing today's
hours reaches the panel" failed.

The harness now sets the flag, which is honest: it has no TLS to offer.
The refusal itself stays covered by lib/device/transport.test.ts, where
the transport can be varied per request rather than per server.

This is the failure CI existed to catch, and it caught it. I ran the
unit tests after adding that rule and not the end-to-end suite, then
pushed three more times on top. The device API is exactly the surface
where only the end-to-end tests exercise the real request path.

The workflow actions are bumped at the same time: checkout and
setup-node v4 target Node 20 and were being forced onto Node 24, which
the run annotated as deprecated on every build. A warning nobody reads
becomes a failure eventually.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012cSY9pVhZmJUKNN7wf1Myd

.github/workflows/ci.yml

@@ -37,8 +37,8 @@ jobs:
       TEST_DATABASE_URL: postgresql://horaires:horaires@localhost:5432/horaires_test?schema=public
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
         with:
           node-version: '22'
           cache: npm
@@ -74,8 +74,8 @@ jobs:
       TEST_DATABASE_URL: postgresql://horaires:horaires@localhost:5432/horaires_e2e?schema=public
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
         with:
           node-version: '22'
           cache: npm
@@ -85,7 +85,7 @@ jobs:
       # The runner can install the system packages a local machine cannot.
       - run: npx playwright install --with-deps chromium
       - run: npm run e2e
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         if: failure()
         with:
           name: playwright-report
@@ -96,10 +96,10 @@ jobs:
     name: Docker image
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: docker/setup-buildx-action@v3
+      - uses: actions/checkout@v7
+      - uses: docker/setup-buildx-action@v4
       - name: Build the runtime image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false