feat(lib): extract CommandLoader from BotClient

- Create dedicated CommandLoader class for command loading logic
- Implement recursive directory scanning
- Add category extraction from file paths
- Add command validation and config-based filtering
- Improve error handling with structured results
- Enable better testability and separation of concerns

src/lib/loaders/CommandLoader.ts

@@ -0,0 +1,110 @@
+import { readdir } from "node:fs/promises";
+import { join } from "node:path";
+import type { Command } from "@lib/types";
+import { config } from "@lib/config";
+import type { LoadResult, LoadError } from "./types";
+import type { Client } from "../BotClient";
+
+/**
+ * Handles loading commands from the file system
+ */
+export class CommandLoader {
+    private client: Client;
+
+    constructor(client: Client) {
+        this.client = client;
+    }
+
+    /**
+     * Load commands 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 command 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.loadCommandFile(filePath, reload, result);
+            }
+        } catch (error) {
+            console.error(`Error reading directory ${dir}:`, error);
+            result.errors.push({ file: dir, error });
+        }
+    }
+
+    /**
+     * Load a single command file
+     */
+    private async loadCommandFile(filePath: string, reload: boolean, result: LoadResult): Promise<void> {
+        try {
+            const importPath = reload ? `${filePath}?t=${Date.now()}` : filePath;
+            const commandModule = await import(importPath);
+            const commands = Object.values(commandModule);
+
+            if (commands.length === 0) {
+                console.warn(`⚠️  No commands found in ${filePath}`);
+                result.skipped++;
+                return;
+            }
+
+            const category = this.extractCategory(filePath);
+
+            for (const command of commands) {
+                if (this.isValidCommand(command)) {
+                    command.category = category;
+
+                    const isEnabled = config.commands[command.data.name] !== false;
+
+                    if (!isEnabled) {
+                        console.log(`🚫 Skipping disabled command: ${command.data.name}`);
+                        result.skipped++;
+                        continue;
+                    }
+
+                    this.client.commands.set(command.data.name, command);
+                    console.log(`✅ Loaded command: ${command.data.name}`);
+                    result.loaded++;
+                } else {
+                    console.warn(`⚠️  Skipping invalid command in ${filePath}`);
+                    result.skipped++;
+                }
+            }
+        } catch (error) {
+            console.error(`❌ Failed to load command from ${filePath}:`, error);
+            result.errors.push({ file: filePath, error });
+        }
+    }
+
+    /**
+     * Extract category from file path
+     * e.g., /path/to/commands/admin/features.ts -> "admin"
+     */
+    private extractCategory(filePath: string): string {
+        const pathParts = filePath.split('/');
+        return pathParts[pathParts.length - 2] ?? "uncategorized";
+    }
+
+    /**
+     * Type guard to validate command structure
+     */
+    private isValidCommand(command: any): command is Command {
+        return command && typeof command === 'object' && 'data' in command && 'execute' in command;
+    }
+}