Add configurable history and storage retention policies

src/routes/settings/+page.svelte

@@ -1,8 +1,9 @@
 <script lang="ts">
     import { onMount } from 'svelte';
     import SectionHeader from '$ui/components/primitives/SectionHeader.svelte';
+    import RetentionTools from '$ui/components/RetentionTools.svelte';
     import Button from '$ui/components/primitives/Button.svelte';
-    import { defaultFleetSettings, fleetSettingLabels, additionalConcurrencyKeys, concurrencyKeys, retentionKeys, settingHelp, type FleetSettings } from '$lib/fleet-settings.js';
+    import { defaultFleetSettings, fleetSettingLabels, additionalConcurrencyKeys, concurrencyKeys, retentionKeys, settingHelp, settingMinimum, type FleetSettings } from '$lib/fleet-settings.js';
     let settings = $state<FleetSettings | null>(null);
     let loading = $state(true);
     let saving = $state(false);
@@ -52,14 +53,15 @@
                         <fieldset disabled={saving}>
                             {#each section.keys as key}
                                 <label for={key}>{fleetSettingLabels[key]}{key.endsWith('Days') ? ' (days)' : ''}</label>
-                                <input id={key} type="number" min={key === 'observationKeepDays' || additionalConcurrencyKeys.includes(key) ? 0 : 1}
+                                <input id={key} type="number" min={settingMinimum(key)}
                                     max={key.endsWith('Days') ? 36500 : undefined} step="1" required bind:value={settings[key]} aria-describedby={`${key}-help`} />
-                                <p id={`${key}-help`}>Default: {defaultFleetSettings[key]}. {settingHelp[key] ?? ''} {additionalConcurrencyKeys.includes(key) ? '0 adds no extra limit.' : ''}</p>
+                                <p id={`${key}-help`}>Default: {defaultFleetSettings[key]}. {settingHelp[key] ?? ''} {additionalConcurrencyKeys.includes(key) ? '0 adds no extra limit.' : key === 'versionKeepDays' ? '0 disables age expiry; the version count policy may still apply.' : key.endsWith('Days') && key !== 'gameFileGraceDays' ? '0 keeps indefinitely.' : ''}</p>
                             {/each}
                             {#if section.title === 'Concurrency'}<p>Lowering a limit lets active operations finish; queued work waits for capacity. Player safety checks still apply.</p>{/if}
                             <Button type="submit" disabled={saving}>{saving ? 'Saving…' : `Save ${section.title.toLowerCase()}`}</Button>
                         </fieldset>
                     </form>
+                    {#if section.title === 'Retention'}<RetentionTools {settings} />{/if}
                 </section>
             {/each}
         {:else}