Add Fresh Harvest integration scaffold

Implements the freshharvest.com two-step login handshake, config flow,
6-hour polling coordinator, and four delivery sensors. Portal page parsing
is not implemented; async_get_next_delivery raises until the account HTML
is mapped against a signed-in session.

custom_components/freshharvest/config_flow.py

@@ -0,0 +1,50 @@
+"""Config flow for Fresh Harvest."""
+
+from __future__ import annotations
+
+from typing import Any
+
+import voluptuous as vol
+
+from homeassistant.config_entries import ConfigFlow, ConfigFlowResult
+from homeassistant.const import CONF_EMAIL, CONF_PASSWORD
+from homeassistant.helpers.aiohttp_client import async_create_clientsession
+
+from .api import FreshHarvestAuthError, FreshHarvestClient, FreshHarvestError
+from .const import DOMAIN
+
+STEP_USER_SCHEMA = vol.Schema(
+    {vol.Required(CONF_EMAIL): str, vol.Required(CONF_PASSWORD): str}
+)
+
+
+class FreshHarvestConfigFlow(ConfigFlow, domain=DOMAIN):
+    """Handle the portal-credentials flow."""
+
+    VERSION = 1
+
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        errors: dict[str, str] = {}
+
+        if user_input is not None:
+            email = user_input[CONF_EMAIL]
+            await self.async_set_unique_id(email.lower())
+            self._abort_if_unique_id_configured()
+
+            # cookie_jar must persist across requests for the token handshake.
+            session = async_create_clientsession(self.hass)
+            client = FreshHarvestClient(session, email, user_input[CONF_PASSWORD])
+            try:
+                await client.async_login()
+            except FreshHarvestAuthError:
+                errors["base"] = "invalid_auth"
+            except FreshHarvestError:
+                errors["base"] = "cannot_connect"
+            else:
+                return self.async_create_entry(title=email, data=user_input)
+
+        return self.async_show_form(
+            step_id="user", data_schema=STEP_USER_SCHEMA, errors=errors
+        )