Add shared seed company resolver concern

Fix request timezone precedence during user enrichment

Refresh records after API lifecycle hooks

Fix false email uniqueness errors when updating users

feat: Add an event for when user creates a new additional company

fix: Fix company user syncs to sandbox, bump to v1.6.42

- fix: sync user/company to sandbox before creating test API key

- feat: schedule sandbox:sync to run hourly
- fix: restore cross-organisation invite flow for existing users

Two related errors were reported in production:

```
DEPRECATED  mb_strtolower(): Passing null to parameter #1 ($string) of type string is deprecated
            in vendor/laravel/framework/src/Illuminate/Support/Str.php on line 611.

TypeError: Fleetbase\Support\Utils::getCurrenyFromCountryCode(): Return value must be of type
           ?string, array returned  (Utils.php:1235)
```

The `fleetbase/countries` package (a fork of PragmaRX Countries) returns the `currencies` field in **two distinct shapes** depending on the underlying data source:

| Shape | Example | Scope |
|---|---|---|
| Sequential list of ISO 4217 strings | `["USD"]` | Most countries (239) |
| Associative map — code as key, detail object as value | `{"USD": {"name": "United States dollar", "symbol": "$"}}` | 10 territories: BQ, CC, CX, GP, GF, MQ, YT, RE, SJ, TK |

The previous code used `Arr::first()` unconditionally on the `currencies` collection:

```php
// Before
'currency' => Arr::first(static::get($country, 'currencies', [])),
```

- **List shape** — `Arr::first()` returns the first *element* (the code string). ✅
- **Map shape** — `Arr::first()` returns the first *value* (an array like `["name" => "...", "symbol" => "..."]`). ❌

This array then propagated into the cached country data and was returned from `getCurrenyFromCountryCode()`, whose return type is `?string`, causing the `TypeError`.

A secondary issue existed in `getCountryCodeByCurrency()` which used the dot-notation shorthand `currencies.0` (only valid for list-shape countries) and then called `strtolower($country['currency'])` without a null guard, triggering the `mb_strtolower(null)` deprecation for map-shape territories.

Introduce a new `Utils::resolveCurrencyCode($currencies): ?string` helper that normalises both shapes:

```php
public static function resolveCurrencyCode($currencies): ?string
{
    if (empty($currencies)) {
        return null;
    }

    // Convert Coollection / Collection objects to a plain array.
    if (is_object($currencies) && method_exists($currencies, 'toArray')) {
        $currencies = $currencies->toArray();
    }

    if (!is_array($currencies)) {
        return null;
    }

    // Sequential list shape: ["USD", "EUR", ...]
    if (array_is_list($currencies)) {
        $code = Arr::first($currencies);
        return is_string($code) ? $code : null;
    }

    // Associative map shape: {"USD": {"name": "...", "symbol": "..."}, ...}
    $code = array_key_first($currencies);
    return is_string($code) ? $code : null;
}
```

- **`getCountryData()`** — replace `Arr::first(...currencies...)` with `resolveCurrencyCode()` so the cached country data always stores a string currency code, never an array.
- **`getCountryCodeByCurrency()`** — replace `currencies.0` dot-notation with `resolveCurrencyCode()` (fixes map-shape countries), and add an `is_string()` guard before `strtolower()` to eliminate the `mb_strtolower(null)` deprecation.

The following 10 territories had associative-map currencies and were broken before this fix:

| cca2 | Territory | Currency |
|---|---|---|
| BQ | Caribbean Netherlands | USD |
| CC | Cocos (Keeling) Islands | AUD |
| CX | Christmas Island | AUD |
| GP | Guadeloupe | EUR |
| GF | French Guiana | EUR |
| MQ | Martinique | EUR |
| YT | Mayotte | EUR |
| RE | Réunion | EUR |
| SJ | Svalbard and Jan Mayen | NOK |
| TK | Tokelau | NZD |

Fix schedule availabilities API

Added template builder backend, expanded transactions tables