Add structured job progress tracking

backend/tests/test_progress.py

@@ -0,0 +1,60 @@
+from pathlib import Path
+
+from app.progress import parse_progress, progress_from_log_path
+
+
+def test_parse_ultralytics_epoch_progress():
+    progress = parse_progress(
+        """
+        Epoch    GPU_mem   box_loss   seg_loss   cls_loss   dfl_loss  Instances       Size
+          3/10         0G      1.234      2.345      0.456      0.789          2        640: 100%|##########| 2/2
+        """,
+        status="running",
+    )
+
+    assert progress["percent"] == 30
+    assert progress["current"] == 3
+    assert progress["total"] == 10
+    assert progress["unit"] == "epoch"
+    assert progress["stage"] == "training"
+
+
+def test_parse_mmengine_epoch_uses_total_epochs_from_command():
+    progress = parse_progress(
+        """
+        COMMAND: python tools/train.py config.py --max-epochs 5
+        Epoch(train) [2][25/50]  lr: 1.0000e-03  eta: 0:00:10
+        """,
+        status="running",
+    )
+
+    assert progress["percent"] == 30
+    assert progress["label"] == "Epoch 2/5 · iter 25/50"
+    assert progress["current"] == 2
+    assert progress["total"] == 5
+
+
+def test_parse_tqdm_percent_fallback():
+    progress = parse_progress("Predict: 42%|####      | 21/50 [00:01<00:02]\n", status="running")
+
+    assert progress["percent"] == 42
+    assert progress["unit"] == "percent"
+    assert progress["stage"] == "prediction"
+
+
+def test_terminal_success_overrides_percent_but_keeps_context():
+    progress = parse_progress("Epoch 2/4 loss=0.5\n", status="success")
+
+    assert progress["percent"] == 100
+    assert progress["stage"] == "completed"
+    assert progress["label"] == "已完成 · Epoch 2/4"
+
+
+def test_progress_from_log_path_reads_tail(tmp_path: Path):
+    log_path = tmp_path / "train.log"
+    log_path.write_text("Epoch 1/2 loss=0.8\n", encoding="utf-8")
+
+    progress = progress_from_log_path(log_path, status="running")
+
+    assert progress["percent"] == 50
+    assert progress["source"] == "epoch_word"