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/Gcp/brick/math/src/Exception/DivisionByZeroException.php

@@ -0,0 +1,38 @@
+<?php
+
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\Exception;
+
+/**
+ * Exception thrown when a division by zero occurs.
+ */
+class DivisionByZeroException extends MathException
+{
+    /**
+     * @return DivisionByZeroException
+     *
+     * @psalm-pure
+     */
+    public static function divisionByZero() : DivisionByZeroException
+    {
+        return new self('Division by zero.');
+    }
+    /**
+     * @return DivisionByZeroException
+     *
+     * @psalm-pure
+     */
+    public static function modulusMustNotBeZero() : DivisionByZeroException
+    {
+        return new self('The modulus must not be zero.');
+    }
+    /**
+     * @return DivisionByZeroException
+     *
+     * @psalm-pure
+     */
+    public static function denominatorMustNotBeZero() : DivisionByZeroException
+    {
+        return new self('The denominator of a rational number cannot be zero.');
+    }
+}

vendor/Gcp/brick/math/src/Exception/IntegerOverflowException.php

@@ -0,0 +1,24 @@
+<?php
+
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\Exception;
+
+use DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\BigInteger;
+/**
+ * Exception thrown when an integer overflow occurs.
+ */
+class IntegerOverflowException extends MathException
+{
+    /**
+     * @param BigInteger $value
+     *
+     * @return IntegerOverflowException
+     *
+     * @psalm-pure
+     */
+    public static function toIntOverflow(BigInteger $value) : IntegerOverflowException
+    {
+        $message = '%s is out of range %d to %d and cannot be represented as an integer.';
+        return new self(\sprintf($message, (string) $value, \PHP_INT_MIN, \PHP_INT_MAX));
+    }
+}

vendor/Gcp/brick/math/src/Exception/MathException.php

@@ -0,0 +1,13 @@
+<?php
+
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\Exception;
+
+/**
+ * Base class for all math exceptions.
+ *
+ * This class is abstract to ensure that only fine-grained exceptions are thrown throughout the code.
+ */
+class MathException extends \RuntimeException
+{
+}

vendor/Gcp/brick/math/src/Exception/NegativeNumberException.php

@@ -0,0 +1,11 @@
+<?php
+
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\Exception;
+
+/**
+ * Exception thrown when attempting to perform an unsupported operation, such as a square root, on a negative number.
+ */
+class NegativeNumberException extends MathException
+{
+}

vendor/Gcp/brick/math/src/Exception/NumberFormatException.php

@@ -0,0 +1,31 @@
+<?php
+
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\Exception;
+
+/**
+ * Exception thrown when attempting to create a number from a string with an invalid format.
+ */
+class NumberFormatException extends MathException
+{
+    /**
+     * @param string $char The failing character.
+     *
+     * @return NumberFormatException
+     *
+     * @psalm-pure
+     */
+    public static function charNotInAlphabet(string $char) : self
+    {
+        $ord = \ord($char);
+        if ($ord < 32 || $ord > 126) {
+            $char = \strtoupper(\dechex($ord));
+            if ($ord < 10) {
+                $char = '0' . $char;
+            }
+        } else {
+            $char = '"' . $char . '"';
+        }
+        return new self(\sprintf('Char %s is not a valid character in the given alphabet.', $char));
+    }
+}

vendor/Gcp/brick/math/src/Exception/RoundingNecessaryException.php

@@ -0,0 +1,20 @@
+<?php
+
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Brick\Math\Exception;
+
+/**
+ * Exception thrown when a number cannot be represented at the requested scale without rounding.
+ */
+class RoundingNecessaryException extends MathException
+{
+    /**
+     * @return RoundingNecessaryException
+     *
+     * @psalm-pure
+     */
+    public static function roundingNecessary() : RoundingNecessaryException
+    {
+        return new self('Rounding is necessary to represent the result of the operation at this scale.');
+    }
+}