GRM-12: feat: add translated operation report for success and failure cases

- Create StepTracker context manager in new report.py module
- Track each step of lifecycle operations (install, update, start, stop, enable,
  disable, status, remove) with begin/done markers
- On success: report lists all completed steps with ✓ icons
- On failure: report shows failed step (✗), completed steps before failure (✓),
  and pending steps that never started (○)
- Add translations for report header, status labels, and registry step names
  in all 5 supported languages (EN/BG/DE/RU/ZH)
- 105 tests, 100% coverage, pyright clean, ruff clean

tests/unit/test_report.py

@@ -0,0 +1,102 @@
+"""Unit tests for the operation report tracker."""
+
+from __future__ import annotations
+
+import pytest
+
+from gitea_runner_manager.exceptions import AnsibleError
+from gitea_runner_manager.report import Step, StepTracker, track_steps
+
+
+class TestStep:
+    def test_init(self) -> None:
+        step = Step("test")
+        assert step.name == "test"
+        assert step.status == "pending"
+
+
+class TestStepTracker:
+    def test_begin(self) -> None:
+        tracker = StepTracker()
+        tracker.begin("step1")
+        assert len(tracker.steps) == 1
+        assert tracker.steps[0].name == "step1"
+        assert tracker.steps[0].status == "in_progress"
+
+    def test_done(self) -> None:
+        tracker = StepTracker()
+        tracker.begin("step1")
+        tracker.done()
+        assert tracker.steps[0].status == "completed"
+
+    def test_done_no_steps(self) -> None:
+        tracker = StepTracker()
+        tracker.done()  # should not raise
+        assert tracker.steps == []
+
+    def test_done_last_not_in_progress(self) -> None:
+        tracker = StepTracker()
+        tracker.begin("step1")
+        tracker.done()
+        tracker.done()  # second done is a no-op
+        assert tracker.steps[0].status == "completed"
+
+
+class TestTrackSteps:
+    def test_success(self, capsys: pytest.CaptureFixture[str]) -> None:
+        with track_steps() as tracker:
+            tracker.begin("step1")
+            tracker.done()
+            tracker.begin("step2")
+            tracker.done()
+
+        captured = capsys.readouterr()
+        assert "Operation Report" in captured.out
+        assert "step1" in captured.out
+        assert "step2" in captured.out
+        assert "✓" in captured.out
+        assert "completed" in captured.out
+
+    def test_failure_marks_step(self, capsys: pytest.CaptureFixture[str]) -> None:
+        with pytest.raises(AnsibleError, match="fail"):
+            with track_steps() as tracker:
+                tracker.begin("step1")
+                tracker.done()
+                tracker.begin("step2")
+                raise AnsibleError("fail")
+
+        captured = capsys.readouterr()
+        assert "Operation Report" in captured.out
+        assert "step1" in captured.out
+        assert "step2" in captured.out
+        assert "✓" in captured.out
+        assert "✗" in captured.out
+        assert "completed" in captured.out
+        assert "failed" in captured.out
+
+    def test_pending_shown_on_failure(self, capsys: pytest.CaptureFixture[str]) -> None:
+        with pytest.raises(AnsibleError, match="fail"):
+            with track_steps() as tracker:
+                tracker.begin("step1")
+                raise AnsibleError("fail")
+
+        captured = capsys.readouterr()
+        assert "✗" in captured.out
+        assert "failed" in captured.out
+
+    def test_empty_report(self, capsys: pytest.CaptureFixture[str]) -> None:
+        with track_steps():
+            pass
+
+        captured = capsys.readouterr()
+        assert "Operation Report" in captured.out
+
+    def test_translated_report(self, monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+        monkeypatch.setenv("GRM_LANG", "bg")
+        with track_steps() as tracker:
+            tracker.begin("step1")
+            tracker.done()
+
+        captured = capsys.readouterr()
+        assert "Отчет за операцията" in captured.out
+        assert "завършено" in captured.out