Integrate MP3 duration extraction and silence handling (#6)

* feat: integrate MP3 duration extraction and silence handling

- Added a new dependency on github.com/tcolgate/mp3 for MP3 frame decoding.
- Implemented actual MP3 duration retrieval in the scanRecordings function, falling back to an estimation if retrieval fails.
- Introduced a silent frame asset for generating silence in audio streams.
- Created a silence reader to provide a continuous stream of silent frames.
- Added necessary documentation and licensing for the new MP3 package.
- Updated .gitignore to exclude MP3 files except for the internal data directory.

* feat: update README and improve application configuration and logging

* refactor: remove unused GenerateFileHash function and improve resource cleanup in MP3 and recorder modules

go.sum

@@ -36,6 +36,8 @@ github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOf
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
+github.com/tcolgate/mp3 v0.0.0-20170426193717-e79c5a46d300 h1:XQdibLKagjdevRB6vAjVY4qbSr8rQ610YzTkWcxzxSI=
+github.com/tcolgate/mp3 v0.0.0-20170426193717-e79c5a46d300/go.mod h1:FNa/dfN95vAYCNFrIKRrlRo+MBLbwmR9Asa5f2ljmBI=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=