i18n: translate all Chinese comments, docstrings, and logger messages to English

Comprehensive translation of Chinese text to English across the entire codebase:

- api/: FastAPI server documentation and logger messages
- cache/: Cache abstraction layer comments and docstrings
- database/: Database models and MongoDB store documentation
- media_platform/: All platform crawlers (Bilibili, Douyin, Kuaishou, Tieba, Weibo, Xiaohongshu, Zhihu)
- model/: Data model documentation
- proxy/: Proxy pool and provider documentation
- store/: Data storage layer comments
- tools/: Utility functions and browser automation
- test/: Test file documentation

Preserved: Chinese disclaimer header (lines 10-18) for legal compliance

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

store/zhihu/__init__.py

@@ -53,7 +53,7 @@ class ZhihuStoreFactory:
 
 async def batch_update_zhihu_contents(contents: List[ZhihuContent]):
     """
-    批量更新知乎内容
+    Batch update Zhihu contents
     Args:
         contents:
 
@@ -68,7 +68,7 @@ async def batch_update_zhihu_contents(contents: List[ZhihuContent]):
 
 async def update_zhihu_content(content_item: ZhihuContent):
     """
-    更新知乎内容
+    Update Zhihu content
     Args:
         content_item:
 
@@ -85,7 +85,7 @@ async def update_zhihu_content(content_item: ZhihuContent):
 
 async def batch_update_zhihu_note_comments(comments: List[ZhihuComment]):
     """
-    批量更新知乎内容评论
+    Batch update Zhihu content comments
     Args:
         comments:
 
@@ -101,7 +101,7 @@ async def batch_update_zhihu_note_comments(comments: List[ZhihuComment]):
 
 async def update_zhihu_content_comment(comment_item: ZhihuComment):
     """
-    更新知乎内容评论
+    Update Zhihu content comment
     Args:
         comment_item:
 
@@ -116,7 +116,7 @@ async def update_zhihu_content_comment(comment_item: ZhihuComment):
 
 async def save_creator(creator: ZhihuCreator):
     """
-    保存知乎创作者信息
+    Save Zhihu creator information
     Args:
         creator: