chore(i18n): finish translating code comments and scripts to English

Completes the English-only standardization for code, comments, scripts
and CI templates (UI/CLI-facing strings stay bilingual pt-BR/en,
untouched). Covers the remaining crates/, apps/gui/ui/ and
apps/gui/src-tauri/ comments, .gitea/ workflow and template comments,
.githooks/ hooks, and the scripts/ source comments for the files
already renamed in a prior commit (check.sh, generate-logo.py,
install-hooks.sh).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VAyr8d7HuAdUGB6aA5xmDD

crates/guara-core/tests/formats.rs

@@ -1,4 +1,4 @@
-//! Detectores estruturais: arquivos reais do sistema com lixo colado no fim (o tamanho tem de ser exato).
+//! Structural format detectors: real files with trailing garbage appended (carved size must be exact).
 
 use guara_core::signatures::detect;
 use guara_core::source::MemSource;
@@ -13,7 +13,7 @@ fn check(path: &str, ext: &str, min_conf: Confidence) -> bool {
     }
     let mut data = std::fs::read(p).unwrap();
     let real = data.len();
-    // lixo depois do fim real (outro arquivo no disco)
+    // append trailing bytes to simulate subsequent disk blocks after EOF
     data.extend((0..5000u32).map(|i| (i.wrapping_mul(2654435761) >> 7) as u8 | 0x81));
     let src = MemSource(data.clone());
     let h =
@@ -129,7 +129,7 @@ fn webm_rar_deb_with_unknown_locations() {
 
 #[test]
 fn synthetic_structures() {
-    // CAB, MIDI, pcap e AIFF montados à mão.
+    // Synthetic CAB, MIDI, PCAP, and AIFF containers with trailing garbage.
     let mut cab = b"MSCF\0\0\0\0".to_vec();
     cab.extend_from_slice(&200u32.to_le_bytes());
     cab.resize(200, 0);