Prepare repository for HACS

Update integration metadata, sync translations, add HACS and Hassfest validation workflows, and add local brand assets for Home Assistant integration branding.

.github/workflows/hassfest.yml

@@ -0,0 +1,18 @@
+name: Hassfest
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  hassfest:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Hassfest validation
+        uses: home-assistant/actions/hassfest@master

.github/workflows/validate.yml

@@ -0,0 +1,19 @@
+name: Validate
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  validate-hacs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: HACS validation
+        uses: hacs/action@main
+        with:
+          category: integration