feat: add S3-compatible storage provider (MinIO, Ceph, R2, etc.)

Adds a new 'S3-Compatible Storage' provider that works with any
S3-API-compatible object storage service, including MinIO, Ceph,
Cloudflare R2, Backblaze B2, and others.

Changes:
- New provider class: classes/providers/storage/s3-compatible-provider.php
  - Provider key: s3compatible
  - Reads user-configured endpoint URL from settings
  - Uses path-style URL access (required by most S3-compatible services)
  - Supports credentials via AS3CF_S3COMPAT_ACCESS_KEY_ID /
    AS3CF_S3COMPAT_SECRET_ACCESS_KEY wp-config.php constants
  - Disables AWS-specific features (Block Public Access, Object Ownership)
- New provider SVG icons (s3compatible.svg, -link.svg, -round.svg)
- Registered provider in main plugin class with endpoint setting support
- Updated StorageProviderSubPage to show endpoint URL input for S3-compatible
- Built pro settings bundle with rollup (Svelte 4.2.19)
- Added package.json and updated rollup.config.mjs for pro-only builds

ui/pro/ToolRunningStatus.svelte

@@ -0,0 +1,94 @@
+<script>
+	import {push} from "svelte-spa-router";
+	import {urls} from "../js/stores";
+	import {running, tools, toolsLocked} from "./stores";
+	import {numToShortString, numToString} from "../js/numToString";
+	import ProgressBar from "../components/ProgressBar.svelte";
+	import ToolRunningButtons from "./ToolRunningButtons.svelte";
+
+	/**
+	 * Returns the currently running tool's details.
+	 *
+	 * @param {Object} tools
+	 * @param {string} running
+	 *
+	 * @return {unknown}
+	 */
+	function runningTool( tools, running ) {
+		return Object.values( tools ).find( ( tool ) => tool.id === running );
+	}
+
+	/**
+	 * Get status description for tool.
+	 *
+	 * @param {Object} tool
+	 * @param {boolean} isRunning
+	 *
+	 * @return {string}
+	 */
+	function toolStatus( tool, isRunning ) {
+		if ( !isRunning ) {
+			return "";
+		}
+
+		if ( tool.short_status_description ) {
+			return tool.short_status_description;
+		}
+
+		return tool.busy_description;
+	}
+
+	$: isRunning = !!$running;
+	$: tool = runningTool( $tools, $running );
+	$: icon = tools.icon( tool, isRunning, true );
+
+	// Buttons should be disabled if another tool is running, current tool is in process of pausing or cancelling, or all tools locked.
+	$: disabled = isRunning && (($running && $running !== tool.id) || (tool.is_processing && tool.is_paused) || tool.is_cancelled || $toolsLocked);
+
+	$: starting = !!(isRunning && tool.progress < 1 && !tool.is_paused);
+	$: status = isRunning ? "(" + numToShortString( tool.queue.processed ) + "/" + numToShortString( tool.queue.total ) + ") " + toolStatus( tool, isRunning ) : "";
+	$: title = isRunning ? tool.name + ": " + tool.progress + "% (" + numToString( tool.queue.processed ) + "/" + numToString( tool.queue.total ) + ")" : "";
+
+	/**
+	 * Returns the numeric percentage progress for the running job.
+	 *
+	 * @param {Object} tool
+	 * @param {boolean} isRunning
+	 *
+	 * @return {number}
+	 */
+	function getPercentComplete( tool, isRunning ) {
+		if ( isRunning ) {
+			return tool.progress;
+		}
+
+		return 0;
+	}
+
+	$: percentComplete = getPercentComplete( tool, isRunning );
+</script>
+
+{#if tool}
+	<div class="nav-status-wrapper tool-running">
+		<!-- TODO: Fix a11y. -->
+		<!-- svelte-ignore a11y-no-static-element-interactions -->
+		<!-- svelte-ignore a11y-click-events-have-key-events -->
+		<div class="nav-status" {title} on:click={() => push("/tools")}>
+			<p class="status-text" {title}>
+				<strong>{tool.progress}%</strong>
+				<span> {@html status}</span>
+			</p>
+			<ProgressBar
+				{percentComplete}
+				{starting}
+				running={isRunning}
+				paused={tool.is_paused}
+				{title}
+			/>
+			<div class="animation-running" {title}>
+				<img src="{$urls.assets + 'img/icon/' + icon}" alt="{tool.status_description}"/>
+			</div>
+		</div>
+		<ToolRunningButtons {tool} {disabled} small/>
+	</div>
+{/if}