feat(lib): extract EventLoader from BotClient

- Create dedicated EventLoader class for event loading logic
- Implement recursive directory scanning
- Add event validation and registration (once vs on)
- Improve error handling with structured results
- Enable better testability and separation of concerns

src/lib/loaders/EventLoader.ts

@@ -0,0 +1,84 @@
+import { readdir } from "node:fs/promises";
+import { join } from "node:path";
+import type { Event } from "@lib/types";
+import type { LoadResult } from "./types";
+import type { Client } from "../BotClient";
+
+/**
+ * Handles loading events from the file system
+ */
+export class EventLoader {
+    private client: Client;
+
+    constructor(client: Client) {
+        this.client = client;
+    }
+
+    /**
+     * Load events from a directory recursively
+     */
+    async loadFromDirectory(dir: string, reload: boolean = false): Promise<LoadResult> {
+        const result: LoadResult = { loaded: 0, skipped: 0, errors: [] };
+        await this.scanDirectory(dir, reload, result);
+        return result;
+    }
+
+    /**
+     * Recursively scan directory for event files
+     */
+    private async scanDirectory(dir: string, reload: boolean, result: LoadResult): Promise<void> {
+        try {
+            const files = await readdir(dir, { withFileTypes: true });
+
+            for (const file of files) {
+                const filePath = join(dir, file.name);
+
+                if (file.isDirectory()) {
+                    await this.scanDirectory(filePath, reload, result);
+                    continue;
+                }
+
+                if (!file.name.endsWith('.ts') && !file.name.endsWith('.js')) continue;
+
+                await this.loadEventFile(filePath, reload, result);
+            }
+        } catch (error) {
+            console.error(`Error reading directory ${dir}:`, error);
+            result.errors.push({ file: dir, error });
+        }
+    }
+
+    /**
+     * Load a single event file
+     */
+    private async loadEventFile(filePath: string, reload: boolean, result: LoadResult): Promise<void> {
+        try {
+            const importPath = reload ? `${filePath}?t=${Date.now()}` : filePath;
+            const eventModule = await import(importPath);
+            const event = eventModule.default;
+
+            if (this.isValidEvent(event)) {
+                if (event.once) {
+                    this.client.once(event.name, (...args) => event.execute(...args));
+                } else {
+                    this.client.on(event.name, (...args) => event.execute(...args));
+                }
+                console.log(`✅ Loaded event: ${event.name}`);
+                result.loaded++;
+            } else {
+                console.warn(`⚠️  Skipping invalid event in ${filePath}`);
+                result.skipped++;
+            }
+        } catch (error) {
+            console.error(`❌ Failed to load event from ${filePath}:`, error);
+            result.errors.push({ file: filePath, error });
+        }
+    }
+
+    /**
+     * Type guard to validate event structure
+     */
+    private isValidEvent(event: any): event is Event<any> {
+        return event && typeof event === 'object' && 'name' in event && 'execute' in event;
+    }
+}