feat(eval): internal-eval stack, judge fixes, and eval web overhaul

- Merge internal-eval into development.sh (single Celery/infra); internal-eval.sh
  wraps with LIFE_ECHO_WITH_INTERNAL_EVAL; EVAL_ATTACH_ONLY for attaching 8001
  when :8000 is already up; document in api/docs/internal-eval.md.
- Evaluation: transcript_for_judge, judge error surfacing, rubric/schema tweaks,
  execution_service and router updates; tests for judge and composite eval.
- Memory: ingest nested transaction for embedding/enrichment rollback safety.
- Conversation WS: logger.exception for pipeline errors (avoid loguru KeyError).
- app-eval-web: Playground saved replays, dialogue turns helper, hash user_id
  for Memoir; Memoir chapter baseline↔DB row compare with title heuristics;
  Stories page (#memoir-stories); Markdown + copy buttons; toolbar/panel UI;
  react-markdown; development proxy and fixture updates.

api/tests/test_transcript_for_judge.py

@@ -0,0 +1,52 @@
+"""评测 transcript 格式化。"""
+
+from types import SimpleNamespace
+
+from app.features.evaluation.transcript_for_judge import (
+    format_eval_turn_block,
+    format_export_turns_with_labels,
+    format_session_messages_with_turn_labels,
+    pair_session_messages_to_turns,
+)
+
+
+def test_format_eval_turn_block_numbering() -> None:
+    s = format_eval_turn_block(0, "你好", "我在呢")
+    assert "[Turn 1]" in s
+    assert "用户: 你好" in s
+    assert "AI: 我在呢" in s
+
+
+def test_split_token_normalized_in_ai() -> None:
+    s = format_eval_turn_block(1, "u", "a[SPLIT]b")
+    assert "AI: a\nb" in s
+
+
+def test_export_turns_labels() -> None:
+    t = format_export_turns_with_labels([("u1", "a1"), ("u2", "a2")])
+    assert "[Turn 1]" in t
+    assert "[Turn 2]" in t
+
+
+def test_pair_session_messages_to_turns() -> None:
+    msgs = [
+        SimpleNamespace(role="system", content="x"),
+        SimpleNamespace(role="human", content="hi"),
+        SimpleNamespace(role="assistant", content="yo"),
+    ]
+    assert pair_session_messages_to_turns(msgs) == [("hi", "yo")]
+
+
+def test_pair_session_messages_trailing_human() -> None:
+    msgs = [SimpleNamespace(role="human", content="only")]
+    assert pair_session_messages_to_turns(msgs) == [("only", "")]
+
+
+def test_session_messages_with_turn_labels() -> None:
+    msgs = [
+        SimpleNamespace(role="human", content="你好"),
+        SimpleNamespace(role="assistant", content="我在"),
+    ]
+    t = format_session_messages_with_turn_labels(msgs)
+    assert "[Turn 1]" in t
+    assert "用户: 你好" in t