Add Last.fm integration plugin with YouTube link support

- Added Last.fm plugin for tracking currently playing music with !register and !np commands
- Added YouTube API integration to provide links to currently playing songs
- Updated help.py and README.md with documentation for the new plugin
- Plugin stores user associations in SQLite database
- Added YouTube API key to .env file for YouTube search functionality
- Supports displaying track name in bold text with album information when available
- Added YouTube link to songs when available

README.md

@@ -292,6 +292,20 @@ Perform IP geolocation lookups with detailed geographic information.
 - ISP/Organization
 - Autonomous System Number (ASN)
 
+### 🎵 Last.fm Integration
+
+**🎵 !register [username] and !np**
+Register your Last.fm username and display currently playing tracks.
+
+**Features:**
+- Associate Matrix ID with Last.fm username
+- Display currently playing tracks
+- Uses SQLite database for user associations
+
+**Commands:**
+- `!register <username>` - Register your Last.fm username
+- `!np` - Display currently playing track
+
 ### ExploitDB Plugin
 
 A security plugin that searches Exploit-DB for vulnerabilities and exploits directly from Matrix.