chore: initial baseline before refactoring

Initial snapshot of Home Assistant config (HAOS 2026.4.4)
prior to dashboard restructuring and helper YAML migration.

Pre-commit cleanup applied:
- Removed blueprints/switch_manager/ (9.4 MB stale, component already gone)
- Removed .storage/switch_manager
- Removed home-assistant.log.{1,old,fault}
- Removed zigbee2mqtt/configuration_backup_v{1..4}.yaml
- Removed zigbee2mqtt/database.db.tmp.2024-09-27 (1.5y old)
- Created empty themes/ to satisfy configuration.yaml include

.gitignore uses allowlist strategy for .storage/ to keep
all tokens, keys, and PINs out of version control.

configuration.yaml

@@ -0,0 +1,37 @@
+# Loads default set of integrations. Do not remove.
+default_config:
+
+# Load frontend themes from the themes folder
+frontend:
+  themes: !include_dir_merge_named themes
+
+automation: !include automations.yaml
+script: !include scripts.yaml
+scene: !include scenes.yaml
+
+http:
+  use_x_forwarded_for: true
+  trusted_proxies:
+    - 192.168.1.0/24
+
+powercalc:
+# monitor_docker:
+#   - name: Docker
+#     url: http://192.168.1.40:2375
+
+recorder:
+  purge_keep_days: 21
+
+input_datetime:
+  whirlpool_letzte_wasserpflege:
+    name: "Whirlpool – Letzte Wasserpflege"
+    has_date: true
+    has_time: false
+  whirlpool_letzter_kartuschenwechsel:
+    name: "Whirlpool – Letzter Kartuschenwechsel"
+    has_date: true
+    has_time: false
+  whirlpool_letzter_wasserwechsel:
+    name: "Whirlpool – Letzter Wasserwechsel"
+    has_date: true
+    has_time: false