feat: L4 AI 诊断报告优化 + Prompt/摘要卡/迁移/文档完善

- 修正 DeepSeek 模型名 deepseek-chat → deepseek-v4-pro
- 摘要块：修复 **粗体** markdown 渲染、左右块可滚动、左块固定粉红色系
- 新增 prompt4（内容摘要卡）+ prompt5（诊断报告）+ 三处 prompt5 优化
- 新增 004 迁移（episodes +content_digest JSONB）、导入脚本、摘要卡生成脚本
- 更新 CLAUDE.md 状态栏/进度/交接备注/关键决策

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/import_content_digests.py

@@ -0,0 +1,78 @@
+"""
+一次性脚本：将 AI 生成的内容摘要卡写入 episodes 表的 content_digest 字段
+数据来源：ai-labeling/experiments/content_digests/_all_digests.json
+前置：先手动执行 backend/sql/004_add_content_digest.sql 添加字段
+"""
+
+import sys
+import os
+import json
+from datetime import date
+
+# Windows 终端中文输出
+sys.stdout.reconfigure(encoding='utf-8')
+sys.stderr.reconfigure(encoding='utf-8')
+
+# 加 backend 到 path
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'backend'))
+
+from app.db.session import get_session
+from app.models.episode import Episode
+from app.models.user import User  # FK 解析需要
+from sqlmodel import select
+
+# ── 1. 读 digest 数据 ──
+project_root = os.path.join(os.path.dirname(__file__), '..')
+digest_file = os.path.join(project_root, 'ai-labeling', 'experiments', 'content_digests', '_all_digests.json')
+
+with open(digest_file, 'r', encoding='utf-8') as f:
+    all_digests = json.load(f)
+
+print(f"读入 {len(all_digests)} 条摘要记录")
+
+# ── 2. 逐条匹配并写入 ──
+session = next(get_session())
+success = 0
+skipped = 0
+mismatch = 0
+
+for d in all_digests:
+    ep_num = d['ep']
+    digest_date = d['date']  # "2026-04-21" 格式
+
+    # 查 episode
+    ep = session.exec(select(Episode).where(Episode.episode_number == ep_num)).first()
+    if not ep:
+        print(f"⚠️  ep{ep_num:02d} 在数据库中不存在，跳过")
+        skipped += 1
+        continue
+
+    # 校验日期
+    if str(ep.air_date) != digest_date:
+        print(f"⚠️  ep{ep_num:02d} 日期不匹配: DB={ep.air_date}, digest={digest_date}，跳过")
+        mismatch += 1
+        continue
+
+    # 写入（只存 digest 字段，不存外壳的 ep/date/title/editor/filename/generated_at）
+    ep.content_digest = d['digest']
+    session.add(ep)
+    success += 1
+    print(f"✅ ep{ep_num:02d} {ep.program_name} <- digest 已写入")
+
+session.commit()
+
+# ── 3. 打印统计 ──
+print()
+print(f"=== 统计 ===")
+print(f"成功写入: {success}")
+print(f"跳过(不存在): {skipped}")
+print(f"跳过(日期不匹配): {mismatch}")
+print(f"总记录: {len(all_digests)}")
+
+# ── 4. 验证：所有 episodes 的 content_digest 状态 ──
+print()
+print(f"=== 验证: episodes content_digest 状态 ===")
+all_eps = session.exec(select(Episode).order_by(Episode.episode_number)).all()
+for e in all_eps:
+    has_digest = "✅" if e.content_digest is not None else "❌"
+    print(f"ep{e.episode_number:02d} | {e.program_name} | {e.air_date} | digest: {has_digest}")