Modernize Discord bot to v14 and Node.js 22

Major upgrades and architectural improvements:
- Upgrade Discord.js from v12 to v14.21.0
- Upgrade Node.js from 14 to 22 LTS
- Switch to pnpm package manager
- Complete rewrite with modern Discord API patterns

New Features:
- Hybrid command system: prefix commands + slash commands
- /sfx slash command with autocomplete for sound discovery
- Modern @discordjs/voice integration for audio
- Improved voice connection management
- Enhanced logging for SFX commands
- Multi-stage Docker build for optimized images

Technical Improvements:
- Modular architecture with services and command handlers
- Proper intent management for Discord gateway
- Better error handling and logging
- Hot-reload capability maintained
- Environment variable support
- Optimized Docker container with Alpine Linux

Breaking Changes:
- Moved main entry from index.js to src/index.js
- Updated configuration structure for v14 compatibility
- Replaced deprecated voice APIs with @discordjs/voice
- Updated audio dependencies (opus, ffmpeg)

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/commands/prefix/sfx.js

@@ -0,0 +1,87 @@
+const axios = require('axios');
+const { chunkSubstr } = require('../../utils/helpers');
+const sfxManager = require('../../services/sfxManager');
+const voiceService = require('../../services/voiceService');
+
+module.exports = {
+  name: 'sfx',
+  description: 'Play a sound effect',
+  
+  async execute(message, args, guildConfig) {
+    // Check if SFX is allowed in this channel
+    if (guildConfig.allowedSfxChannels) {
+      const allowedChannels = new RegExp(guildConfig.allowedSfxChannels);
+      if (!allowedChannels.test(message.channel.name)) {
+        return;
+      }
+    }
+
+    const sfxName = args[0];
+    
+    // Log the SFX command
+    if (sfxName) {
+      console.log(
+        `SFX '${sfxName}' requested in ${guildConfig.internalName || message.guild.name}#${message.channel.name} from @${message.author.username}`
+      );
+    }
+
+    // If no SFX specified, show the list
+    if (!sfxName) {
+      try {
+        const response = await axios.get('https://rentry.co/ghbotsfx/raw');
+        
+        // Break into chunks if message is too long
+        let chunks = [response.data];
+        if (response.data.length > 2000) {
+          chunks = chunkSubstr(response.data, Math.ceil(response.data.length / 2));
+        }
+
+        for (const chunk of chunks) {
+          await message.channel.send(chunk);
+        }
+      } catch (error) {
+        console.error('Error fetching SFX list:', error);
+        await message.reply('Could not fetch the SFX list.');
+      }
+      return;
+    }
+
+    // Check if SFX exists
+    if (!sfxManager.hasSFX(sfxName)) {
+      return message.reply('This sound effect does not exist!');
+    }
+
+    // Check if user is in a voice channel
+    if (!message.member.voice.channel) {
+      return message.reply('You need to be in a voice channel to use this command!');
+    }
+
+    try {
+      // Join the voice channel
+      await voiceService.join(message.member.voice.channel);
+
+      // Get the SFX file path
+      const sfxPath = sfxManager.getSFXPath(sfxName);
+
+      // Play the sound effect
+      await voiceService.play(
+        message.guild.id, 
+        sfxPath, 
+        { 
+          volume: guildConfig.sfxVolume || 0.5 
+        }
+      );
+
+      // Leave the voice channel after playing
+      setTimeout(() => {
+        voiceService.leave(message.guild.id);
+      }, 500);
+      
+      console.log(`✅ Successfully played SFX '${sfxName}'`);
+
+    } catch (error) {
+      console.error(`❌ Error playing SFX '${sfxName}':`, error);
+      await message.reply("I couldn't play that sound effect. Make sure I have permission to join your voice channel!");
+    }
+  }
+};