Merge origin/main into dev: sync bug fixes from main

Merges 4 PRs from main:
- PR#15: Fix ffmpeg spawn failure causing infinite retry loop
- PR#16: Fix Docker restart crash (respect autoStart flag, persist identity)
- PR#17: Add missing "play" script to package.json
- PR#18: Add detailed update/upgrade instructions to README

Conflict resolution in src/data/database.ts:
- Combined dev's serverProtocol/ts6ApiKey fields with main's identity field
- Extended migrateSchema() to also migrate serverProtocol and ts6ApiKey columns
- Updated SQL schema and upsert query to include all three new columns

src/ts-protocol/client.ts

@@ -77,6 +77,18 @@ export class TS3Client extends EventEmitter {
   }
 
   async connect(): Promise<void> {
+    // Clean up any existing connection before creating a new one
+    if (this.client) {
+      this.logger.info("Cleaning up previous connection before reconnecting");
+      try {
+        await this.client.disconnect();
+      } catch {
+        // Ignore errors during cleanup
+      }
+      this.client = null;
+      this.clientId = 0;
+    }
+
     const addr = `${this.options.host}:${this.options.port}`;
 
     // Detect or use forced protocol