feat: remove licensing system and bump version to 4.0.0-cloudhost

- Remove AS3CF_Pro_Licences_Updates instantiation and all $this->licence
  references from the PHP backend; stub methods return safe defaults
  (is_valid_licence → true, is_licence_over_media_limit → false,
  feature_enabled → true, is_pro_plugin_setup bypasses licence check)
- Remove Licences REST API endpoint from add_api_endpoints()
- Remove 'licence' from allowed settings keys
- Bump version from 3.2.12 to 4.0.0-cloudhost in version.php and plugin header
- Replace licence derived store with hardcoded always-valid writable store
- Simplify enableAssets store to depend only on config.assets_settings
- Remove licence panel row from Nav flyout; remove licence check from
  offload remaining button disabled logic
- Replace Header licence display with "Internal Build" label
- Remove LicencePage route registration from pages.js; drop licence
  import and is_valid guards from all isNextRoute functions
- Rebuild compiled Svelte bundle

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ui/pro/Nav.svelte

@@ -1,7 +1,6 @@
 <script>
-	import {link} from "svelte-spa-router";
-	import {bucket_writable, counts, strings, urls} from "../js/stores";
-	import {licence, offloadRemainingWithCount, running, tools} from "./stores";
+	import {bucket_writable, counts, strings} from "../js/stores";
+	import {offloadRemainingWithCount, running, tools} from "./stores";
 	import Nav from "../components/Nav.svelte";
 	import OffloadStatus from "../components/OffloadStatus.svelte";
 	import ToolRunningStatus from "./ToolRunningStatus.svelte";
@@ -16,16 +15,11 @@
 	/**
 	 * Get a message describing why the offload remaining button is disabled, if it is.
 	 *
-	 * @param {Object} licence
 	 * @param {Object} counts
 	 *
 	 * @return {string}
 	 */
-	function getOffloadRemainingDisabledMessage( licence, counts ) {
-		if ( !licence.is_set ) {
-			return $strings.no_licence;
-		}
-
+	function getOffloadRemainingDisabledMessage( counts ) {
 		if ( counts.total < 1 ) {
 			return $strings.no_media;
 		}
@@ -34,19 +28,6 @@
 			return $strings.all_media_offloaded;
 		}
 
-		if (
-			licence.limit_info.counts_toward_limit &&
-			licence.limit_info.total > 0 &&
-			licence.limit_info.limit > 0 &&
-			licence.limit_info.total >= licence.limit_info.limit
-		) {
-			if ( licence.limit_info.total > licence.limit_info.limit ) {
-				return $strings.licence_limit_exceeded;
-			}
-
-			return $strings.licence_limit_reached;
-		}
-
 		if ( ! $bucket_writable ) {
 			return $strings.disabled_tool_bucket_access;
 		}
@@ -54,7 +35,7 @@
 		return "";
 	}
 
-	$: offloadRemainingDisabledMessage = getOffloadRemainingDisabledMessage( $licence, $counts );
+	$: offloadRemainingDisabledMessage = getOffloadRemainingDisabledMessage( $counts );
 
 	/**
 	 * Close the flyout panel and kick off the offloader.
@@ -85,22 +66,6 @@
 								{$offloadRemainingWithCount}
 							</Button>
 						</PanelRow>
-
-						<PanelRow footer class="licence">
-							<div class="details">
-								<p class="title">{$strings.plan_usage_title}</p>
-								<p>{$licence.plan_usage}</p>
-							</div>
-							{#if !$licence.is_set}
-								<a href="/license" use:link>
-									{$strings.activate_licence}
-								</a>
-							{:else if $licence.limit_info.limit !== 0}
-								<a href={$urls.licenses} target="_blank" class="upgrade">
-									{$strings.upgrade_plan_cta}
-								</a>
-							{/if}
-						</PanelRow>
 					</svelte:fragment>
 				</OffloadStatusFlyout>
 			</svelte:fragment>