refactor: reorganize components, improve online status, and enforce linting (tolwi#656)

* reset some sensors when goes offline
* simplify online/offline status detection
* fixed all linter issues
* add GitHub Actions linting workflow
* actualize docs

Author: tolwi

.github/workflows/lint.yaml

@@ -0,0 +1,31 @@
+name: Lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+          cache: "pip"
+
+      - name: Install dependencies
+        run: |
+          pip install ruff mypy
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
+      - name: Lint with ruff
+        run: ruff check custom_components
+
+      - name: Type check with mypy
+        run: mypy custom_components

.gitignore

@@ -6,6 +6,5 @@ venv
 .vscode/settings.json
 .coverage
 requirements.test.txt
-requirements.txt
 setup.cfg
 tests