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/application/use_cases/add_audio_track.rs

@@ -0,0 +1,48 @@
+use anyhow::Result;
+use crate::domain::entities::{AudioTrack, Project, Track};
+use crate::domain::value_objects::{FilePath, SyncOffset, TrackLanguage};
+
+/// Adiciona uma faixa de áudio externa ao projeto.
+pub struct AddAudioTrack;
+
+impl AddAudioTrack {
+    pub fn execute(
+        project: &mut Project,
+        path: FilePath,
+        offset: SyncOffset,
+        language: TrackLanguage,
+    ) -> Result<()> {
+        let id = project.next_track_id();
+        let track = AudioTrack::new(id, path, offset, language);
+        project.tracks.push(Track::Audio(track));
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::domain::entities::{MkvOutput, VideoFile};
+    use crate::domain::value_objects::FilePath;
+
+    #[test]
+    fn adiciona_audio_no_projeto() {
+        let mut project = Project::new(
+            VideoFile::new(FilePath::from("input.mkv")),
+            MkvOutput::new(FilePath::from("output.mkv")),
+        )
+        .unwrap();
+
+        let lang = TrackLanguage::new("por").unwrap();
+        AddAudioTrack::execute(
+            &mut project,
+            FilePath::from("audio_pt.aac"),
+            SyncOffset::default(),
+            lang,
+        )
+        .unwrap();
+
+        assert_eq!(project.tracks.len(), 1);
+        assert!(matches!(project.tracks[0], Track::Audio(_)));
+    }
+}