feat: enable S3 video uploads and update related configurations

- Added support for self-hosted S3 video uploads with new environment variables: OPENFRAME_ENABLE_S3_VIDEO_UPLOADS and OPENFRAME_MAX_VIDEO_UPLOAD_BYTES.
- Updated .env.example and .env.docker.example to reflect new configuration options.
- Enhanced Content Security Policy to include origins for S3-compatible storage.
- Updated dependencies for AWS SDK to support new features.
- Refactored upload logic to accommodate both Bunny and S3 upload providers.
- Updated documentation to clarify the usage of direct uploads and S3 configurations.
- Closes #11

app/api/upload/audio/route.ts

@@ -37,6 +37,9 @@ const MIME_ALIASES: Record<string, string> = {
   'audio/x-pn-wav': 'audio/wav',
   'audio/mp3': 'audio/mpeg',
   'audio/x-mpeg': 'audio/mpeg',
+  // Some browsers report MediaRecorder audio-only blobs as video/* containers.
+  'video/webm': 'audio/webm',
+  'video/mp4': 'audio/mp4',
 };
 
 // Map canonical MIME to fallback file extension
@@ -231,7 +234,8 @@ export async function POST(request: NextRequest) {
       await releaseStorageReservation(reservationId);
       return apiErrors.badRequest('File content does not match an audio format');
     }
-    if (!hasValidAudioMagicBytes(buffer.slice(0, 16), contentType)) {
+    const hasValidMagicBytes = hasValidAudioMagicBytes(buffer.slice(0, 16), contentType);
+    if (!hasValidMagicBytes) {
       await releaseStorageReservation(reservationId);
       return apiErrors.badRequest('File content does not match the declared audio format');
     }