feat: Implement a core plugin system, integrate flag icon assets, and establish a GitHub release workflow.

app/Core/PluginManager.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace App\Core;
+
+class PluginManager
+{
+    /**
+     * @var string Path to plugins directory
+     */
+    private $pluginsDir;
+
+    /**
+     * @var array List of active plugins
+     */
+    private $activePlugins = [];
+
+    public function __construct()
+    {
+        $this->pluginsDir = dirname(__DIR__, 2) . '/plugins'; // Root/plugins
+    }
+
+    /**
+     * Load all active plugins
+     */
+    public function loadPlugins()
+    {
+        // Ensure plugins directory exists
+        if (!is_dir($this->pluginsDir)) {
+            return;
+        }
+
+        // 1. Get List of Active Plugins (For now, we load ALL folders as active)
+        // TODO: Implement database/config check for active status
+        $plugins = scandir($this->pluginsDir);
+
+        foreach ($plugins as $pluginName) {
+            if ($pluginName === '.' || $pluginName === '..') {
+                continue;
+            }
+
+            $pluginPath = $this->pluginsDir . '/' . $pluginName;
+            
+            // Check if it is a directory and has specific plugin file
+            if (is_dir($pluginPath) && file_exists($pluginPath . '/plugin.php')) {
+                $this->loadPlugin($pluginName, $pluginPath);
+            }
+        }
+
+        // Fire 'plugins_loaded' action after all plugins are loaded
+        Hooks::doAction('plugins_loaded');
+    }
+
+    /**
+     * Load a single plugin
+     * 
+     * @param string $name Plugin folder name
+     * @param string $path Full path to plugin directory
+     */
+    private function loadPlugin($name, $path)
+    {
+        try {
+            require_once $path . '/plugin.php';
+            $this->activePlugins[] = $name;
+        } catch (\Exception $e) {
+            error_log("Failed to load plugin [$name]: " . $e->getMessage());
+        }
+    }
+
+    /**
+     * Get list of loaded plugins
+     * 
+     * @return array
+     */
+    public function getActivePlugins()
+    {
+        return $this->activePlugins;
+    }
+}