feat: implement project management and media track handling

- Added domain entities for audio, subtitle, and video tracks.
- Created a Project entity to manage media editing sessions.
- Implemented value objects for file paths, sync offsets, track IDs, and languages.
- Developed infrastructure for asynchronous FFmpeg process execution.
- Built a user interface for selecting video files, adding audio and subtitle tracks, and managing output settings.
- Integrated error handling and logging for media processing tasks.

src/domain/entities/audio_track.rs

@@ -0,0 +1,17 @@
+use serde::{Deserialize, Serialize};
+use crate::domain::value_objects::{FilePath, SyncOffset, TrackId, TrackLanguage};
+
+/// Faixa de áudio externa adicionada pelo usuário.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct AudioTrack {
+    pub id: TrackId,
+    pub path: FilePath,
+    pub offset: SyncOffset,
+    pub language: TrackLanguage,
+}
+
+impl AudioTrack {
+    pub fn new(id: TrackId, path: FilePath, offset: SyncOffset, language: TrackLanguage) -> Self {
+        AudioTrack { id, path, offset, language }
+    }
+}