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/services/sfxManager.js

@@ -0,0 +1,113 @@
+const fs = require('fs');
+const path = require('path');
+
+class SFXManager {
+  constructor() {
+    this.sfxPath = path.join(__dirname, '..', '..', 'sfx');
+    this.sfxList = [];
+    
+    // Load SFX list initially
+    this.loadSFXList();
+    
+    // Watch for changes
+    this.watchSFXDirectory();
+  }
+
+  /**
+   * Load the list of available SFX files
+   */
+  loadSFXList() {
+    try {
+      if (!fs.existsSync(this.sfxPath)) {
+        console.log('SFX directory not found, creating...');
+        fs.mkdirSync(this.sfxPath, { recursive: true });
+      }
+
+      const files = fs.readdirSync(this.sfxPath);
+      this.sfxList = files
+        .filter(file => file.endsWith('.mp3') || file.endsWith('.wav'))
+        .map(file => {
+          const ext = path.extname(file);
+          return {
+            name: file.replace(ext, ''),
+            filename: file,
+            path: path.join(this.sfxPath, file)
+          };
+        });
+      
+      console.log(`Loaded ${this.sfxList.length} sound effects`);
+    } catch (error) {
+      console.error('Error loading SFX list:', error);
+    }
+  }
+
+  /**
+   * Watch the SFX directory for changes
+   */
+  watchSFXDirectory() {
+    fs.watch(this.sfxPath, (eventType, filename) => {
+      if (eventType === 'rename') {
+        console.log('SFX directory changed, reloading...');
+        this.loadSFXList();
+      }
+    });
+  }
+
+  /**
+   * Get all available SFX
+   * @returns {Array} List of SFX objects
+   */
+  getAllSFX() {
+    return this.sfxList;
+  }
+
+  /**
+   * Get SFX names for autocomplete
+   * @returns {Array} List of SFX names
+   */
+  getSFXNames() {
+    return this.sfxList.map(sfx => sfx.name);
+  }
+
+  /**
+   * Find an SFX by name
+   * @param {string} name 
+   * @returns {Object|undefined} SFX object or undefined
+   */
+  findSFX(name) {
+    return this.sfxList.find(sfx => sfx.name.toLowerCase() === name.toLowerCase());
+  }
+
+  /**
+   * Check if an SFX exists
+   * @param {string} name 
+   * @returns {boolean}
+   */
+  hasSFX(name) {
+    return this.findSFX(name) !== undefined;
+  }
+
+  /**
+   * Get the file path for an SFX
+   * @param {string} name 
+   * @returns {string|null}
+   */
+  getSFXPath(name) {
+    const sfx = this.findSFX(name);
+    return sfx ? sfx.path : null;
+  }
+
+  /**
+   * Search SFX names (for autocomplete)
+   * @param {string} query 
+   * @returns {Array} Matching SFX names
+   */
+  searchSFX(query) {
+    const lowerQuery = query.toLowerCase();
+    return this.sfxList
+      .filter(sfx => sfx.name.toLowerCase().includes(lowerQuery))
+      .map(sfx => sfx.name);
+  }
+}
+
+module.exports = new SFXManager();