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

vendor/Aws3/Aws/History.php

@@ -0,0 +1,134 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\RequestInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Exception\AwsException;
+/**
+ * Represents a history container that is required when using the history
+ * middleware.
+ */
+class History implements \Countable, \IteratorAggregate
+{
+    private $maxEntries;
+    private $entries = array();
+    /**
+     * @param int $maxEntries Maximum number of entries to store.
+     */
+    public function __construct($maxEntries = 10)
+    {
+        $this->maxEntries = $maxEntries;
+    }
+    /**
+     * @return int
+     */
+    #[\ReturnTypeWillChange]
+    public function count()
+    {
+        return \count($this->entries);
+    }
+    #[\ReturnTypeWillChange]
+    public function getIterator()
+    {
+        return new \ArrayIterator(\array_values($this->entries));
+    }
+    /**
+     * Get the last finished command seen by the history container.
+     *
+     * @return CommandInterface
+     * @throws \LogicException if no commands have been seen.
+     */
+    public function getLastCommand()
+    {
+        if (!$this->entries) {
+            throw new \LogicException('No commands received');
+        }
+        return \end($this->entries)['command'];
+    }
+    /**
+     * Get the last finished request seen by the history container.
+     *
+     * @return RequestInterface
+     * @throws \LogicException if no requests have been seen.
+     */
+    public function getLastRequest()
+    {
+        if (!$this->entries) {
+            throw new \LogicException('No requests received');
+        }
+        return \end($this->entries)['request'];
+    }
+    /**
+     * Get the last received result or exception.
+     *
+     * @return ResultInterface|AwsException
+     * @throws \LogicException if no return values have been received.
+     */
+    public function getLastReturn()
+    {
+        if (!$this->entries) {
+            throw new \LogicException('No entries');
+        }
+        $last = \end($this->entries);
+        if (isset($last['result'])) {
+            return $last['result'];
+        }
+        if (isset($last['exception'])) {
+            return $last['exception'];
+        }
+        throw new \LogicException('No return value for last entry.');
+    }
+    /**
+     * Initiate an entry being added to the history.
+     *
+     * @param CommandInterface $cmd Command be executed.
+     * @param RequestInterface $req Request being sent.
+     *
+     * @return string Returns the ticket used to finish the entry.
+     */
+    public function start(CommandInterface $cmd, RequestInterface $req)
+    {
+        $ticket = \uniqid();
+        $this->entries[$ticket] = ['command' => $cmd, 'request' => $req, 'result' => null, 'exception' => null];
+        return $ticket;
+    }
+    /**
+     * Finish adding an entry to the history container.
+     *
+     * @param string $ticket Ticket returned from the start call.
+     * @param mixed  $result The result (an exception or AwsResult).
+     */
+    public function finish($ticket, $result)
+    {
+        if (!isset($this->entries[$ticket])) {
+            throw new \InvalidArgumentException('Invalid history ticket');
+        }
+        if (isset($this->entries[$ticket]['result']) || isset($this->entries[$ticket]['exception'])) {
+            throw new \LogicException('History entry is already finished');
+        }
+        if ($result instanceof \Exception) {
+            $this->entries[$ticket]['exception'] = $result;
+        } else {
+            $this->entries[$ticket]['result'] = $result;
+        }
+        if (\count($this->entries) >= $this->maxEntries) {
+            $this->entries = \array_slice($this->entries, -$this->maxEntries, null, \true);
+        }
+    }
+    /**
+     * Flush the history
+     */
+    public function clear()
+    {
+        $this->entries = [];
+    }
+    /**
+     * Converts the history to an array.
+     *
+     * @return array
+     */
+    public function toArray()
+    {
+        return \array_values($this->entries);
+    }
+}