Move domain models into domain package with schemas and validate with zod + elysia. Some maintenence as well

apps/portal/src/routes/calculator/+page.svelte

@@ -1,13 +1,15 @@
 <script lang="ts">
     import {
-        Activity,
         DEFAULT_STANDARDS_DATA,
-        Gender,
-        lbToKg,
         Standards,
-        type Metrics,
         type StandardsConfig,
     } from "@blade-and-brawn/calculator";
+    import {
+        Activity,
+        Gender,
+        lbToKg,
+        type Metrics,
+    } from "@blade-and-brawn/domain";
     import StandardsTable from "$lib/components/StandardsTable.svelte";
     import PlayersTable from "$lib/components/PlayersTable.svelte";
 
@@ -15,6 +17,7 @@
 
     const defaultStandards = new Standards(DEFAULT_STANDARDS_DATA);
 
+    // TODO: try to clean this up
     let input = $state({
         activity: Activity.BenchPress,
         metrics: {