refactor: 清理冗余代码和过时配置

app/services/pi_client.py

@@ -13,11 +13,8 @@ from pathlib import Path
 from app.config import settings
 from app.utils import truncate_error
 from app.services.summary_utils import (
-    JsonNotFoundError,
     build_prompt,
-    extract_json,
     extract_pdf_text,
-    write_meta_json,
 )
 
 logger = logging.getLogger(__name__)
@@ -25,18 +22,6 @@ logger = logging.getLogger(__name__)
 # PDF 全文注入模式的字符上限 — 超过此阈值自动切换到 search 模式
 _PDF_MAX_CHARS = 80_000
 
-# 重新导出，保持向后兼容
-__all__ = [
-    "PiTimeoutError",
-    "PiProcessError",
-    "JsonNotFoundError",
-    "call_pi",
-    "write_meta_json",
-    "extract_pdf_text",
-    "build_prompt",
-    "extract_json",
-]
-
 
 # ── 自定义异常 ──────────────────────────────────────────────────────────