Surface add-on prices and add an add-ons total sensor

Add-on rows already carried quantity, unit and extended price; only the name
was exposed. The attribute now renders the full line and a new monetary
sensor reports the add-ons subtotal separately from the box.

The fixture totals were copied from a seven-add-on cart while the fixture
itself had one, so they are now self-consistent and a test asserts that
add-ons plus box price equals the portal's subtotal.

custom_components/freshharvest/manifest.json

@@ -1,12 +1,16 @@
 {
   "domain": "freshharvest",
   "name": "Fresh Harvest",
-  "codeowners": ["@flan"],
+  "codeowners": [
+    "@flan"
+  ],
   "config_flow": true,
   "documentation": "https://git.onetick.ninja/flan/ha-freshharvest",
   "integration_type": "service",
   "iot_class": "cloud_polling",
   "issue_tracker": "https://git.onetick.ninja/flan/ha-freshharvest/issues",
-  "requirements": ["beautifulsoup4>=4.12"],
-  "version": "0.1.0"
+  "requirements": [
+    "beautifulsoup4>=4.12"
+  ],
+  "version": "0.2.0"
 }