Remove unused test files and tokenization modules

- Deleted `windowDelineation.test.ts` as it is no longer needed.
- Removed `index.ts` and `tokenizer.ts` from the tokenization module due to refactoring.
- Eliminated unused types related to authentication, code citation, context provider API, and core functionalities.
- Cleaned up the `status.ts` file by removing the `StatusKind` type definition.

backend/prompt.py

@@ -1,4 +1,11 @@
 from typing import Tuple
+from datetime import datetime, timezone, timedelta
+
+def _get_current_datetime() -> str:
+    now = datetime.now(timezone(timedelta(hours=8)))
+    weekdays = ["星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"]
+    weekday = weekdays[now.weekday()]
+    return f"{now.year}年{now.month}月{now.day}日 {weekday} {now.hour:02d}:{now.minute:02d}:{now.second:02d}"
 
 def _sanitize_language_id(language_id: str) -> str:
     if not language_id:
@@ -25,8 +32,11 @@ def prepare_prompt_context(prefix: str, suffix: str) -> Tuple[str, str]:
 def build_prompt(prefix: str, suffix: str, language_id: str = "markdown") -> str:
     safe_language_id = _sanitize_language_id(language_id)
     recent_prefix, recent_suffix = _prepare_context(prefix, suffix)
+    current_time = _get_current_datetime()
 
-    prompt = f"""You are an inline completion engine for a {safe_language_id} editor with ghost-text suggestions.
+    prompt = f"""Current time: {current_time}
+
+You are an inline completion engine for a {safe_language_id} editor with ghost-text suggestions.
 
 Your job:
 - Return ONLY the text that should be inserted at the cursor between PREFIX and SUFFIX.