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>

media_platform/douyin/field.py

@@ -23,21 +23,21 @@ from enum import Enum
 
 class SearchChannelType(Enum):
     """search channel type"""
-    GENERAL = "aweme_general"  # 综合
-    VIDEO = "aweme_video_web"  # 视频
-    USER = "aweme_user_web"  # 用户
-    LIVE = "aweme_live"  # 直播
+    GENERAL = "aweme_general"  # General
+    VIDEO = "aweme_video_web"  # Video
+    USER = "aweme_user_web"  # User
+    LIVE = "aweme_live"  # Live
 
 
 class SearchSortType(Enum):
     """search sort type"""
-    GENERAL = 0  # 综合排序
-    MOST_LIKE = 1  # 最多点赞
-    LATEST = 2  # 最新发布
+    GENERAL = 0  # Comprehensive sorting
+    MOST_LIKE = 1  # Most likes
+    LATEST = 2  # Latest published
 
 class PublishTimeType(Enum):
     """publish time type"""
-    UNLIMITED = 0  # 不限
-    ONE_DAY = 1  # 一天内
-    ONE_WEEK = 7  # 一周内
-    SIX_MONTH = 180  # 半年内
+    UNLIMITED = 0  # Unlimited
+    ONE_DAY = 1  # Within one day
+    ONE_WEEK = 7  # Within one week
+    SIX_MONTH = 180  # Within six months