refactor: inject OCR runtime settings

app/adapters/external/ocr.py

@@ -1,7 +1,8 @@
 import base64
+import importlib
 from typing import Optional
 
-from app.runtime.config import settings
+from app.application.configuration import get_runtime_settings
 from app.adapters.network.http import RequestUtils
 
 
@@ -10,7 +11,15 @@ class OcrHelper:
     OCR 辅助类，负责获取验证码图片并调用 OCR 服务识别文本。
     """
 
-    _ocr_b64_url = f"{settings.OCR_HOST}/captcha/base64"
+    def __init__(self, ocr_base_url: Optional[str] = None) -> None:
+        """初始化 OCR 服务地址，优先使用组合根设置快照。"""
+        if ocr_base_url is None:
+            try:
+                ocr_base_url = get_runtime_settings().get("OCR_HOST")
+            except RuntimeError:
+                legacy_settings = importlib.import_module("app.runtime.config").settings
+                ocr_base_url = legacy_settings.OCR_HOST
+        self._ocr_b64_url = f"{str(ocr_base_url).rstrip('/')}/captcha/base64"
 
     def get_captcha_text(
             self,