Centralize paths in paths.py and harden waybill-number handling

- Add paths.py: BASE_DIR/DOWNLOAD_DIR/CONFIG_PATH anchored on __file__
  so paths resolve regardless of the launch cwd
- Route main_router and all site modules through DOWNLOAD_DIR/CONFIG_PATH,
  replacing os.getcwd()-based download dirs and the "config.yaml" literal
- main_router compare engine: read Excel as str with keep_default_na,
  strip/normalize 运单号, drop blanks, and isin against a set so
  int/float-vs-str mismatches no longer produce false "undelivered"
- Shunxin: give downloaded files unique microsecond temp names and read
  Excel as str to preserve long-waybill precision
- Normalize bare except: to except Exception: across affected files

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

site_baishi.py

@@ -4,12 +4,14 @@ import os
 import yaml
 from playwright.sync_api import sync_playwright
 
+from paths import DOWNLOAD_DIR, CONFIG_PATH
+
 
 def baishi_download_undelivered_data(page):
     """百世：一键提取应到未到（当日未扫）数据"""
     print("\n▶ 开始执行【百世 - 一键提取应到未到数据】任务...")
 
-    download_dir = os.path.join(os.getcwd(), "downloads")
+    download_dir = DOWNLOAD_DIR
     if not os.path.exists(download_dir):
         os.makedirs(download_dir)
 
@@ -60,7 +62,7 @@ def baishi_download_undelivered_data(page):
         print(">> 正在读取本地配置文件并进行授权验证...")
         password = ""
         try:
-            with open("config.yaml", "r", encoding="utf-8") as f:
+            with open(CONFIG_PATH, "r", encoding="utf-8") as f:
                 config = yaml.safe_load(f)
                 password = config.get("baishi", {}).get("password", "")