feat(admin): 比价记录 debug 页后端——补全链路 + DB 迁移

model/schema 的 debug 字段已在 4ee6de2 起头,本次补完整条链路:
- repo upsert 存客户端环境/性能字段;端点同机拉 pricebot llm_calls 落库 + 算 llm次数/重试
- schema 加 platform_results 透传(admin「卡在哪一步」从 raw_payload 读)
- admin 比价记录查询接口(按 user_id/phone 列表分页 + 详情含 llm_calls)
- 迁移 comparison_debug_fields: 给 comparison_record 加环境/性能/llm_calls 列(全 nullable)

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

app/api/v1/compare_record.py

@@ -19,6 +19,7 @@ from fastapi import APIRouter, HTTPException, Query, status
 
 from app.api.deps import CurrentUser, DbSession
 from app.repositories import comparison as crud_compare
+from app.services.pricebot_llm_calls import fetch_llm_calls
 from app.schemas.compare_record import (
     CompareStatsOut,
     ComparisonRecordCreatedOut,
@@ -42,13 +43,22 @@ def report_record(
     payload: ComparisonRecordIn, user: CurrentUser, db: DbSession
 ) -> ComparisonRecordCreatedOut:
     rec = crud_compare.upsert_record(db, user_id=user.id, payload=payload)
+    # 同机拉 pricebot 本次比价的 LLM 调用明细落库(best-effort,失败不阻断上报)。
+    # llm_call_count/retry_count 直接由明细派生:次数=条数,重试=带 error 的条数。
+    calls = fetch_llm_calls(rec.trace_id)
+    if calls:
+        rec.llm_calls = calls
+        rec.llm_call_count = len(calls)
+        rec.retry_count = sum(1 for c in calls if c.get("error"))
+        db.commit()
     logger.info(
-        "compare record user=%s trace=%s biz=%s status=%s saved=%s",
+        "compare record user=%s trace=%s biz=%s status=%s saved=%s llm_calls=%d",
         user.id,
         rec.trace_id,
         rec.business_type,
         rec.status,
         rec.saved_amount_cents,
+        len(calls),
     )
     return ComparisonRecordCreatedOut(id=rec.id)