fix: 修复语义依赖检测 Python 代码缩进错误

之前的 commit 3c3ce55 错误地在 checkSemanticStatus 的 Python 代码
每行前添加了一个空格，导致 Python IndentationError，使得前端
始终显示"语义搜索依赖未安装"。

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

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

ccw/src/tools/codex-lens.ts

@@ -196,9 +196,9 @@ async function checkSemanticStatus(): Promise<SemanticStatus> {
   // Check semantic module availability and accelerator info
   return new Promise((resolve) => {
     const checkCode = `
- import sys
- import json
- try:
+import sys
+import json
+try:
     import codexlens.semantic as semantic
     SEMANTIC_AVAILABLE = bool(getattr(semantic, "SEMANTIC_AVAILABLE", False))
     SEMANTIC_BACKEND = getattr(semantic, "SEMANTIC_BACKEND", None)