feat: implement session-level recording with self/bot audio filtering

- Add RecordingSession tracking for guild-level audio mixing
- Filter out self user and bot users before subscribing to audio streams
- Register segments with session metadata for post-processing
- Finalize recording sessions on connection destroy or explicit stop
- Update test mocks to properly simulate stream chain and constructors
- Remove mock-crc import (no longer needed with current dependencies)
- Add 'type: module' to package.json for ES module support

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tsconfig.json

@@ -11,7 +11,8 @@
     "rootDir": "src",
     "experimentalDecorators": true,
     "emitDecoratorMetadata": true,
-    "jsx": "react-jsx"
+    "jsx": "react-jsx",
+    "resolveJsonModule": true
   },
   "include": ["src/**/*"],
   "exclude": ["node_modules", "dist"]