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>

model/m_bilibili.py

@@ -33,11 +33,11 @@ from pydantic import BaseModel, Field
 
 
 class VideoUrlInfo(BaseModel):
-    """B站视频URL信息"""
+    """Bilibili video URL information"""
     video_id: str = Field(title="video id (BV id)")
     video_type: str = Field(default="video", title="video type")
 
 
 class CreatorUrlInfo(BaseModel):
-    """B站创作者URL信息"""
+    """Bilibili creator URL information"""
     creator_id: str = Field(title="creator id (UID)")