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

classes/api/v1/state.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\API\V1;
+
+use DeliciousBrains\WP_Offload_Media\API\API;
+use WP_REST_Request;
+use WP_REST_Response;
+
+class State extends API {
+	/** @var int */
+	protected static $version = 1;
+
+	/** @var string */
+	protected static $name = 'state';
+
+	/**
+	 * Register REST API routes.
+	 */
+	public function register_routes() {
+		register_rest_route(
+			static::api_namespace(),
+			static::route(),
+			array(
+				'methods'             => 'GET',
+				'callback'            => array( $this, 'get_state' ),
+				'permission_callback' => array( $this, 'check_permissions' ),
+			)
+		);
+	}
+
+	/**
+	 * Processes a REST GET request and returns the current state.
+	 *
+	 * @param WP_REST_Request $request
+	 *
+	 * @return WP_REST_Response|mixed
+	 */
+	public function get_state( WP_REST_Request $request ) {
+		$params = $request->get_params();
+
+		$skip_transient = false;
+		$force          = false;
+		$forced_blog_id = 0;
+
+		if ( ! empty( $params['refreshMediaCounts'] ) ) {
+			$skip_transient = true;
+			$force          = true;
+			$forced_blog_id = -1;
+		}
+
+		return $this->rest_ensure_response(
+			'get',
+			static::name(),
+			array_merge(
+				$this->endpoint_common_response( Settings::name() ),
+				array(
+					'counts'                   => $this->as3cf->media_counts( $skip_transient, $force, $forced_blog_id ),
+					'summary_counts'           => $this->as3cf->get_summary_counts(),
+					'offload_remaining_upsell' => $this->as3cf->get_offload_remaining_upsell_message(),
+					'upgrades'                 => $this->as3cf->get_upgrades_info(),
+					'settings_validation'      => $this->as3cf->settings_validation_status(),
+				)
+			)
+		);
+	}
+}