A8多套打包+M4归档+R5多图:存量功能备份

A8 多套交付包(packaging_task.py):
- 修复交付包只打第1条混乱note的bug,按ImageCandidate.strategy分A/B/C组
- 每组生独立note_0N夹(6图+文案.txt),同seq留最新去重,老数据兼容
- task74端到端验:3套各6图,独立agent7项交叉验证全过

M4 归档(tasks.py/exports.py/前端):
- list_tasks加date_from/date_to/product_id筛选+product_name批量填(防N+1)
- 新增exports.py:产品JSON导出+标杆CSV导出(UTF-8 BOM)
- 前端HistoryFilters日期/产品筛选+产品列+打回原因红banner
- response.py加raise_param_error;独立agent验A1/A2/A9通过

R5 产品多图(product_images.py/020迁移/前端):
- product_images表+5端点(上传/列/改场景/设主图/删图)
- 生图按ROLE_SCENE_PREFERENCE选对应场景图,回落primary
- 前端ProductImageManager多图画廊

R6 账号config拆页(settings/):
- 配置页按角色拆/settings(运营+组长+admin)+/config(仅admin)
- Key只显末4位不显余额(守红线)

核销表对齐真实代码状态:D1改稿框/M7裂变/E12评图分纠偏为已完成(曾漏回写)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app/services/ai_engine/constants.py

@@ -70,6 +70,23 @@ PAGE_ROLES = [
 ]
 PAGE_ROLE_MAP = {r["role"]: r for r in PAGE_ROLES}
 
+# ── R5多图：分镜role → 优先产品图场景(scene) 偏好表 ──────────
+# 生图时按分镜 role 选该场景的产品图当参考；取不到回落主图(primary)。
+# scene 取值见 enums.ProductImageScene：primary/scene/texture/ingredient/model
+ROLE_SCENE_PREFERENCE = {
+    "hook":            ["scene", "primary"],       # 封面：真实生活场景优先
+    "pain_scene":      ["scene", "primary"],       # 痛点共鸣：使用前情境
+    "product_closeup": ["primary"],                # 单品特写：白底主图
+    "ingredient":      ["ingredient", "primary"],  # 成分拆解：成分/包装细节
+    "texture":         ["texture", "primary"],     # 质地展示：质地特写
+    "applied_proof":   ["model", "scene", "primary"],  # 上脸：上脸图/场景
+    "social_proof":    ["scene", "primary"],       # 社交背书：场景
+    "closer":          ["primary"],                # 促单收尾：主图
+    "scenario":        ["scene", "primary"],
+    "tutorial":        ["model", "scene", "primary"],
+}
+
+
 # ── 生图风格预设（扒 image.js STYLE_PROMPTS:26-29）──────────
 # 按 style 参数选小红书风格调性，注入 base_prompt 的"视觉风格"行
 STYLE_PROMPTS = {