Expose every order component as its own entity and prepare for release

Each cost line is now an entity rather than an attribute: subtotal, box price,
add-ons, tax and delivery fee, plus a total and free-delivery-remaining for the
open order, a delivery-day sensor, and a binary sensor that turns off at the
cutoff. Entities share a base class and declare a scope, so a description
states only the field it reads.

Also parses the driver tip, Bounty savings and the free-delivery threshold. The
threshold is carried across orders because the progress bar only renders on
carts that have not met it.

Adds LICENSE, hacs.json, a CI workflow, a pre-publish audit script, and a test
that cross-checks every entity's translation_key against both translation
files. Manifest URLs now point at GitHub rather than a private forge.

custom_components/freshharvest/entity.py

@@ -0,0 +1,56 @@
+"""Shared entity plumbing for Fresh Harvest.
+
+Entities read one of three things: the account as a whole, the order arriving
+next, or the order that can still be changed. Declaring that as a `scope` keeps
+each entity's `value_fn` down to the field it actually cares about, instead of
+every one of them repeating the same None checks.
+"""
+
+from __future__ import annotations
+
+from typing import Literal
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.helpers.device_registry import DeviceEntryType, DeviceInfo
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from .api import AccountSnapshot, DeliveryOrder
+from .const import DOMAIN
+from .coordinator import FreshHarvestCoordinator
+
+Scope = Literal["account", "next_order", "open_order"]
+
+
+def resolve_scope(
+    snapshot: AccountSnapshot, scope: Scope
+) -> AccountSnapshot | DeliveryOrder | None:
+    """Return the object a scope points at, or None when there is no such order."""
+    if scope == "account":
+        return snapshot
+    return getattr(snapshot, scope)
+
+
+class FreshHarvestEntity(CoordinatorEntity[FreshHarvestCoordinator]):
+    """Base for every Fresh Harvest entity."""
+
+    _attr_has_entity_name = True
+
+    def __init__(
+        self,
+        coordinator: FreshHarvestCoordinator,
+        entry: ConfigEntry,
+        key: str,
+    ) -> None:
+        super().__init__(coordinator)
+        self._attr_unique_id = f"{entry.entry_id}_{key}"
+        self._attr_device_info = DeviceInfo(
+            identifiers={(DOMAIN, entry.entry_id)},
+            name="Fresh Harvest",
+            manufacturer="Fresh Harvest",
+            entry_type=DeviceEntryType.SERVICE,
+            configuration_url="https://freshharvest.com/p/dashboard/details",
+        )
+
+    def target(self, scope: Scope) -> AccountSnapshot | DeliveryOrder | None:
+        """Resolve this entity's scope against the latest snapshot."""
+        return resolve_scope(self.coordinator.data, scope)