Implement sequences feature v1.1.0

- Add -s/--sequence option to select transformation sequences
- Add -L flag to list all available sequences
- Implement 5 hardcoded sequences: default, lower, upper, minimal, utf-8
- Refactor clean_filename() to support sequence-based transformations
- Update all tests to pass sequence parameter (25 tests passing)
- Add 8 new integration tests for sequence functionality
- Update documentation (README, CHANGELOG, manpage)
- Update shell completions (bash, zsh, fish)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/integration_tests.rs

@@ -257,3 +257,135 @@ fn test_conf_option_missing_file() {
         .failure()
         .stderr(predicate::str::contains("nicht gefunden"));
 }
+
+#[test]
+fn test_sequence_lower() {
+    let temp_dir = TempDir::new().unwrap();
+    let config_file = temp_dir.path().join("empty.toml");
+    fs::write(&config_file, "[replacements]\n").unwrap();
+    let file_path = temp_dir.path().join("Test File.txt");
+    fs::write(&file_path, "content").unwrap();
+
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("--conf")
+        .arg(&config_file)
+        .arg("-s")
+        .arg("lower")
+        .arg(temp_dir.path());
+    cmd.assert().success();
+
+    assert!(temp_dir.path().join("test_file.txt").exists());
+}
+
+#[test]
+fn test_sequence_upper() {
+    let temp_dir = TempDir::new().unwrap();
+    let config_file = temp_dir.path().join("empty.toml");
+    fs::write(&config_file, "[replacements]\n").unwrap();
+    let file_path = temp_dir.path().join("test file.txt");
+    fs::write(&file_path, "content").unwrap();
+
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("--conf")
+        .arg(&config_file)
+        .arg("-s")
+        .arg("upper")
+        .arg(temp_dir.path());
+    cmd.assert().success();
+
+    assert!(temp_dir.path().join("TEST_FILE.TXT").exists());
+}
+
+#[test]
+fn test_sequence_minimal() {
+    let temp_dir = TempDir::new().unwrap();
+    let config_file = temp_dir.path().join("empty.toml");
+    fs::write(&config_file, "[replacements]\n").unwrap();
+    let file_path = temp_dir.path().join("Müller Datei.txt");
+    fs::write(&file_path, "content").unwrap();
+
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("--conf")
+        .arg(&config_file)
+        .arg("-s")
+        .arg("minimal")
+        .arg(temp_dir.path());
+    cmd.assert().success();
+
+    // Umlaute bleiben erhalten, nur Leerzeichen ersetzt
+    assert!(temp_dir.path().join("Müller_Datei.txt").exists());
+}
+
+#[test]
+fn test_sequence_utf8() {
+    let temp_dir = TempDir::new().unwrap();
+    let config_file = temp_dir.path().join("empty.toml");
+    fs::write(&config_file, "[replacements]\n").unwrap();
+    let file_path = temp_dir.path().join("schön (1).txt");
+    fs::write(&file_path, "content").unwrap();
+
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("--conf")
+        .arg(&config_file)
+        .arg("-s")
+        .arg("utf-8")
+        .arg(temp_dir.path());
+    cmd.assert().success();
+
+    // Umlaut bleibt, Klammern entfernt
+    assert!(temp_dir.path().join("schön_1.txt").exists());
+}
+
+#[test]
+fn test_list_sequences() {
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("-L");
+    cmd.assert()
+        .success()
+        .stdout(predicate::str::contains("default"))
+        .stdout(predicate::str::contains("lower"))
+        .stdout(predicate::str::contains("upper"))
+        .stdout(predicate::str::contains("minimal"))
+        .stdout(predicate::str::contains("utf-8"));
+}
+
+#[test]
+fn test_list_sequences_verbose() {
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("-L").arg("-v");
+    cmd.assert()
+        .success()
+        .stdout(predicate::str::contains("Umlauts → ASCII"))
+        .stdout(predicate::str::contains("Case transform"));
+}
+
+#[test]
+fn test_invalid_sequence() {
+    let temp_dir = TempDir::new().unwrap();
+
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("-s").arg("invalid_seq").arg(temp_dir.path());
+    cmd.assert()
+        .failure()
+        .stderr(predicate::str::contains("Unbekannte Sequence"));
+}
+
+#[test]
+fn test_sequence_default_explicit() {
+    let temp_dir = TempDir::new().unwrap();
+    let config_file = temp_dir.path().join("empty.toml");
+    fs::write(&config_file, "[replacements]\n").unwrap();
+    let file_path = temp_dir.path().join("Müller File.txt");
+    fs::write(&file_path, "content").unwrap();
+
+    let mut cmd = Command::new(cargo_bin!("ntu"));
+    cmd.arg("--conf")
+        .arg(&config_file)
+        .arg("-s")
+        .arg("default")
+        .arg(temp_dir.path());
+    cmd.assert().success();
+
+    // Default: Umlaut → ASCII
+    assert!(temp_dir.path().join("Mueller_File.txt").exists());
+}