Add SDK persistence and configurable edge location

- Add external SDK installation (wp-content/twilio-sdk/) that survives
  WordPress plugin updates
- Add install-twilio-sdk-external.sh script for external SDK setup
- Update SDK loading to check external location first, internal fallback
- Add post-update detection hook to warn if SDK was deleted
- Add configurable Twilio Edge Location setting (default: roaming)
- Fix US calls failing due to hardcoded Sydney edge location

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

install-twilio-sdk-external.sh

@@ -0,0 +1,158 @@
+#!/bin/bash
+
+# Script to install Twilio PHP SDK to an external location
+# This prevents SDK from being deleted when WordPress updates the plugin
+#
+# Location: wp-content/twilio-sdk/ (outside plugin folder)
+
+echo "Installing Twilio PHP SDK v8.7.0 to external location..."
+echo "This will install the SDK outside the plugin folder to survive plugin updates."
+
+# Check if we can download files
+if ! command -v curl &> /dev/null; then
+    echo "ERROR: curl is required to download the SDK"
+    echo "Please install curl and try again"
+    exit 1
+fi
+
+if ! command -v tar &> /dev/null; then
+    echo "ERROR: tar is required to extract the SDK"
+    echo "Please install tar and try again"
+    exit 1
+fi
+
+# Get the script directory (plugin directory)
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Calculate wp-content directory (two levels up from plugin)
+# Plugin is at: wp-content/plugins/twilio-wp-plugin/
+# We want: wp-content/twilio-sdk/
+WP_CONTENT_DIR="$(dirname "$(dirname "$SCRIPT_DIR")")"
+SDK_DIR="$WP_CONTENT_DIR/twilio-sdk"
+
+echo "Plugin directory: $SCRIPT_DIR"
+echo "SDK will be installed to: $SDK_DIR"
+
+# Create SDK directory
+mkdir -p "$SDK_DIR/twilio/sdk"
+
+# Download the latest release (8.7.0)
+echo "Downloading Twilio SDK from GitHub..."
+TEMP_DIR=$(mktemp -d)
+cd "$TEMP_DIR"
+
+if ! curl -L https://github.com/twilio/twilio-php/archive/refs/tags/8.7.0.tar.gz -o twilio-sdk.tar.gz; then
+    echo "ERROR: Failed to download Twilio SDK"
+    echo "Please check your internet connection and try again"
+    rm -rf "$TEMP_DIR"
+    exit 1
+fi
+
+# Extract the archive
+echo "Extracting SDK files..."
+if ! tar -xzf twilio-sdk.tar.gz; then
+    echo "ERROR: Failed to extract SDK files"
+    rm -rf "$TEMP_DIR"
+    exit 1
+fi
+
+# Check if the extracted directory exists
+if [ ! -d "twilio-php-8.7.0/src" ]; then
+    echo "ERROR: Extracted SDK directory structure is unexpected"
+    rm -rf "$TEMP_DIR"
+    exit 1
+fi
+
+# Remove existing SDK if it exists
+if [ -d "$SDK_DIR/twilio/sdk" ]; then
+    echo "Removing existing SDK installation..."
+    rm -rf "$SDK_DIR/twilio/sdk"
+    mkdir -p "$SDK_DIR/twilio/sdk"
+fi
+
+# Move the entire src directory to be the sdk
+echo "Installing SDK files..."
+if ! mv twilio-php-8.7.0/src/* "$SDK_DIR/twilio/sdk/"; then
+    echo "ERROR: Failed to move SDK files"
+    rm -rf "$TEMP_DIR"
+    exit 1
+fi
+
+# Create a comprehensive autoloader
+cat > "$SDK_DIR/autoload.php" << 'EOF'
+<?php
+/**
+ * Twilio SDK v8.7.0 Autoloader (External Installation)
+ * This file loads the Twilio PHP SDK classes
+ *
+ * Location: wp-content/twilio-sdk/autoload.php
+ * This location survives WordPress plugin updates
+ */
+
+// Prevent multiple registrations
+if (!defined('TWILIO_AUTOLOADER_REGISTERED')) {
+    define('TWILIO_AUTOLOADER_REGISTERED', true);
+
+    // Register the autoloader
+    spl_autoload_register(function ($class) {
+        // Only handle Twilio classes
+        if (strpos($class, 'Twilio\\') !== 0) {
+            return false;
+        }
+
+        // Convert class name to file path
+        $relative_class = substr($class, 7); // Remove 'Twilio\'
+        $file = __DIR__ . '/twilio/sdk/' . str_replace('\\', '/', $relative_class) . '.php';
+
+        if (file_exists($file)) {
+            require_once $file;
+            return true;
+        }
+
+        return false;
+    });
+
+    // Try to load the SDK's own autoloader if it exists
+    $sdk_autoloader = __DIR__ . '/twilio/sdk/autoload.php';
+    if (file_exists($sdk_autoloader)) {
+        require_once $sdk_autoloader;
+    }
+
+    // Load essential Twilio classes manually to ensure they're available
+    $essential_classes = [
+        __DIR__ . '/twilio/sdk/Rest/Client.php',
+        __DIR__ . '/twilio/sdk/TwiML/VoiceResponse.php',
+        __DIR__ . '/twilio/sdk/Exceptions/TwilioException.php',
+        __DIR__ . '/twilio/sdk/Security/RequestValidator.php'
+    ];
+
+    foreach ($essential_classes as $class_file) {
+        if (file_exists($class_file)) {
+            require_once $class_file;
+        }
+    }
+}
+EOF
+
+# Clean up temp directory
+cd "$SCRIPT_DIR"
+rm -rf "$TEMP_DIR"
+
+# Verify installation
+echo ""
+echo "Verifying installation..."
+if [ -f "$SDK_DIR/autoload.php" ] && [ -d "$SDK_DIR/twilio/sdk" ]; then
+    echo "=============================================="
+    echo "Twilio SDK v8.7.0 installed successfully!"
+    echo "=============================================="
+    echo ""
+    echo "Installation location: $SDK_DIR"
+    echo ""
+    echo "This SDK is installed OUTSIDE the plugin folder,"
+    echo "so it will NOT be deleted when WordPress updates the plugin."
+    echo ""
+    echo "The plugin will automatically detect this external SDK."
+else
+    echo "Installation failed - files not found"
+    exit 1
+fi