feat(launch_confirm): 新增启动确认样本列表内部接口(供 pricebot distill 回读)

补齐「启动确认窗自进化闭环」里 app-server 这一侧的读路径:pricebot 的 launch_confirm
LLM 兜底成功样本会 server→server 落到 app-server 的 launch_confirm_sample 表;本提交
新增「样本列表查询」内部接口, 供 pricebot 的 scripts/distill_launch_confirm.py 回读这些
样本、按「宿主包 × 文案变体」聚合沉淀出候选规则。

- app/api/internal/launch_confirm.py: 新增样本列表内部接口(server→server, 不走用户 JWT)
- app/repositories/launch_confirm_sample.py: 样本列表查询
- app/schemas/launch_confirm_sample.py: 列表响应 schema

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/internal/launch_confirm.py

@@ -11,6 +11,7 @@ from __future__ import annotations
 
 import hmac
 import logging
+from datetime import datetime, timedelta, timezone
 from typing import Annotated
 
 from fastapi import APIRouter, Header, HTTPException, status
@@ -21,6 +22,7 @@ from app.repositories import launch_confirm_sample as repo
 from app.schemas.launch_confirm_sample import (
     LaunchConfirmSampleIn,
     LaunchConfirmSampleOut,
+    LaunchConfirmSampleRow,
 )
 
 logger = logging.getLogger("shagua.internal.launch_confirm")
@@ -61,3 +63,34 @@ def report_launch_confirm_sample(
         payload.exec_success, payload.trace_id,
     )
     return LaunchConfirmSampleOut(id=sid)
+
+
+@router.get(
+    "/launch-confirm-samples",
+    response_model=list[LaunchConfirmSampleRow],
+    summary="启动确认窗兜底样本列表(沉淀脚本 distill 读; server→server, 不走 JWT)",
+)
+def list_launch_confirm_samples(
+    db: DbSession,
+    x_internal_secret: Annotated[str | None, Header()] = None,
+    exec_success: bool | None = None,
+    host_package: str | None = None,
+    since_days: int | None = None,
+    limit: int = 1000,
+) -> list[LaunchConfirmSampleRow]:
+    """读样本供 pricebot 的 distill_launch_confirm.py 聚合沉淀回 PROFILES。
+
+    与上报端点同一把共享密钥;exec_success/host_package/since_days 均可选,limit 默认 1000。
+    """
+    _check_secret(x_internal_secret)
+    since = None
+    if since_days and since_days > 0:
+        since = datetime.now(timezone.utc) - timedelta(days=since_days)
+    rows = repo.list_samples(
+        db,
+        exec_success=exec_success,
+        host_package=host_package,
+        since=since,
+        limit=limit,
+    )
+    return [LaunchConfirmSampleRow.model_validate(r) for r in rows]