feat: ✨ add an experimental Traefik chart (simplification proposal)

Author: darkweaver87

.github/workflows/experimental.yml

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+name: experimental chart - tests
+
+on:
+  pull_request:
+    paths:
+      - "experimental/**"
+      - ".github/workflows/experimental.yml"
+      # stable CRDs are mirrored into experimental/crds — re-check on bumps
+      - "traefik/crds/**"
+  push:
+    branches: [ master ]
+    paths:
+      - "experimental/**"
+      - "traefik/crds/**"
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: experimental
+    steps:
+      - uses: actions/checkout@v4
+      - uses: azure/setup-helm@v4
+      - name: Install helm-unittest plugin
+        run: helm plugin install https://github.com/helm-unittest/helm-unittest
+      - name: CRDs in sync with the stable chart
+        run: ./hack/check-crds-sync.sh
+      - name: Unit tests
+        run: helm unittest .
+      - name: Lint
+        run: helm lint .
+      - name: Render defaults
+        run: helm template traefik . >/dev/null
+      - name: values.schema.json is up to date
+        # Regenerate and fail if it differs from the committed file, so
+        # values.yaml @schema annotations can't drift from the schema.
+        # Pin the plugin version: its output is not stable across releases.
+        run: |
+          python3 ./hack/test_build_schema.py
+          helm plugin install https://github.com/losisin/helm-values-schema-json --version v2.5.0 --verify=false
+          python3 ./hack/build_schema.py
+          git diff --exit-code values.schema.json

experimental/.helmignore

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+# Patterns to ignore when packaging/loading the chart.
+.git/
+.gitignore
+.DS_Store
+.vscode/
+.idea/
+*.bak
+*.tmproj
+# Editor / tooling dotfiles that are not chart content.
+.mcp.json
+__pycache__/

experimental/Chart.yaml

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+apiVersion: v2
+name: traefik-experimental
+description: EXPERIMENTAL Traefik chart (simplification proposal) — unreleased, not for production
+type: application
+version: 0.1.0
+appVersion: "v3.7.5"
+# Matches the Kubernetes OpenAPI version values.schema.json is built
+# against (hack/build_schema.py K8S_VERSION) so the schema's validation
+# surface and the declared support window stay in lockstep.
+kubeVersion: ">=1.32.0-0"
+keywords:
+  - traefik
+  - ingress
+home: https://traefik.io
+sources:
+  - https://github.com/traefik/traefik-helm-chart
+icon: https://raw.githubusercontent.com/traefik/traefik/master/docs/content/assets/img/traefik.logo.png
+# Supported Traefik Proxy + Hub version ranges. Templates read these
+# via `index .Chart.Annotations "..."` (matches the upstream chart's
+# convention from PR traefik/traefik-helm-chart#1791) so version bumps
+# happen here, not buried in helpers.
+annotations:
+  traefik.io/proxy-min-version: v3.6.0
+  traefik.io/proxy-max-version: v3.7.5
+  traefik.io/hub-min-version: v3.19.0
+  traefik.io/hub-max-version: v3.19.4