feat: 添加 AI Agent 对话测试工具 + 代码优化

主要变更:

- 新增 tests/test_ai_chat.py: AI Agent 对话测试工具

- 优化 core/pydantic_ai_agent.py 和 db/chat_log_db.py

- 清理归档文件，更新文档

Made-with: Cursor

customer_db/schema.json

@@ -1,91 +0,0 @@
-{
-  "_注释": "本文件是 customers.json 的字段说明，不参与程序运行，仅供人工查阅。",
-  "字段说明": {
-    "customer_id":          "客户ID（平台用户名/ID）",
-    "name":                 "真实姓名",
-    "nickname":             "昵称",
-    "email":                "邮箱",
-    "phone":                "手机号",
-    "wechat":               "微信号",
-    "address":              "收货地址",
-    "platform":             "来源平台（淘宝/拼多多/微信等）",
-    "platform_id":          "平台内部ID",
-
-    "budget":               "预算描述（客户自述）",
-    "budget_range_min":     "预算下限（元）",
-    "budget_range_max":     "预算上限（元）",
-    "requirements":         "历史需求列表",
-    "preference_services":  "偏好服务类型列表",
-
-    "total_orders":         "累计下单次数",
-    "total_spent":          "累计消费金额（元）",
-    "avg_order_value":      "平均客单价（元）",
-    "purchase_frequency":   "购买频次描述",
-    "last_order_date":      "最后下单日期",
-    "first_order_date":     "首次下单日期",
-    "order_ids":            "订单号列表",
-    "pending_orders":       "待处理订单数",
-    "completed_orders":     "已完成订单数",
-    "refund_count":         "退款次数",
-
-    "personality":          "性格标签列表（如：急躁/爽快/纠结）",
-    "communication_prefer": "沟通偏好",
-    "response_speed":       "回复速度描述",
-    "patience_level":       "耐心程度",
-
-    "customer_level":       "客户等级（A/B/C/D）",
-    "vip":                  "是否VIP",
-    "vip_level":            "VIP等级（0=无）",
-    "vip_custom_price":     "VIP专属报价（0=无专属价）",
-
-    "last_price":           "上次报价金额（元）",
-    "last_price_time":      "上次报价时间",
-    "last_quote_no_convert": "上次报价后未成交，下次可适当降低",
-    "lowest_price_accepted":"历史接受过的最低价（元）",
-    "discount_given_count": "累计让价次数",
-    "price_sensitivity":    "价格敏感度（高/中/低，自动计算）",
-    "decision_speed":       "决策速度（快/慢，自动标记）",
-
-    "good_reviews":         "好评次数",
-    "bad_reviews":          "差评次数",
-    "dispute_count":        "纠纷次数",
-
-    "follow_up_by":         "跟进负责人",
-    "follow_up_date":       "跟进日期",
-    "next_follow_date":     "下次跟进日期",
-    "source":               "客户来源渠道",
-    "coupon_used":          "使用过的优惠券",
-
-    "notes":                "备注列表（含自动报价记录）",
-    "tags":                 "自定义标签列表",
-    "created_at":           "建档时间",
-    "last_contact":         "最后联系时间",
-    "last_update":          "最后更新时间",
-
-    "last_image_url":       "最后发来的图片URL",
-    "last_image_time":      "最后发图时间",
-    "processing_status":    "当前作图状态（pending/processing/done等）",
-    "processing_image_url": "当前处理中的图片URL",
-    "expected_done_at":     "预计完成时间",
-
-    "preferred_format":     "偏好文件格式（jpg/png/psd等）",
-    "preferred_size":       "偏好尺寸/分辨率描述",
-    "total_images_sent":    "历史发图总数",
-    "complexity_history":   "历史图片复杂度列表（normal/complex/hard）",
-    "image_type_history":   "历史图片类型列表（印花/logo/人物等）",
-
-    "bulk_potential":       "批量潜力（有/无/未知）",
-    "churn_risk":           "流失风险（高/中/低，自动计算）",
-    "upsell_opportunity":   "加购机会标签（如：分层PSD/批量打包）",
-    "revision_count":       "累计改稿次数",
-    "revision_orders":      "有改稿的订单数",
-    "total_completed_orders":"已完成出图的订单数",
-
-    "blacklist":            "是否黑名单",
-    "blacklist_reason":     "拉黑原因",
-    "last_email_status":    "最后邮件发送状态（sent/failed）",
-
-    "last_conversation_summary": "上次对话AI摘要（15字以内）",
-    "last_conversation_time":    "上次对话时间"
-  }
-}