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/value_objects/track_language.rs

@@ -0,0 +1,57 @@
+use anyhow::{anyhow, Result};
+use serde::{Deserialize, Serialize};
+
+/// Código de idioma ISO 639-2 (3 letras minúsculas), ex: "por", "eng".
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct TrackLanguage(String);
+
+impl TrackLanguage {
+    /// Cria um TrackLanguage validando o formato ISO 639-2 (3 letras minúsculas).
+    pub fn new(code: impl Into<String>) -> Result<Self> {
+        let code = code.into();
+        if code.len() == 3 && code.chars().all(|c| c.is_ascii_lowercase()) {
+            Ok(TrackLanguage(code))
+        } else {
+            Err(anyhow!(
+                "Código de idioma inválido: '{}'. Esperado formato ISO 639-2 (3 letras minúsculas, ex: 'por', 'eng')",
+                code
+            ))
+        }
+    }
+
+    pub fn as_str(&self) -> &str {
+        &self.0
+    }
+}
+
+impl std::fmt::Display for TrackLanguage {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn idioma_valido() {
+        assert!(TrackLanguage::new("por").is_ok());
+        assert!(TrackLanguage::new("eng").is_ok());
+    }
+
+    #[test]
+    fn idioma_invalido_curto() {
+        assert!(TrackLanguage::new("pt").is_err());
+    }
+
+    #[test]
+    fn idioma_invalido_maiusculo() {
+        assert!(TrackLanguage::new("POR").is_err());
+    }
+
+    #[test]
+    fn idioma_invalido_longo() {
+        assert!(TrackLanguage::new("port").is_err());
+    }
+}