refactor(config): 优化版本信息显示格式

- 将版本信息初始化为空字符串，避免显示"未知"
- 在显示插件版本时前面添加空格，保持格式一致性
- 在显示 Phigros 版本时前后添加空格，优化视觉效果

Author: molanp

phi-plugin/config.py

@@ -13,8 +13,8 @@
 VERSION_PATTERN = re.compile(
     r"https://img\.shields\.io/badge/(?P<type>插件版本|Phigros)-(?P<version>(.*))-9cf"
 )
-currentVersion = "未知"
-phigros_ver = "未知"
+currentVersion = ""
+phigros_ver = ""
 with contextlib.suppress(Exception):
     if (PATH / "README.md").exists():
         with open(PATH / "README.md", encoding="utf-8") as f:
@@ -24,9 +24,9 @@
             version = match["version"]
 
             if ver_type == "插件版本":
-                currentVersion = f"v{version}"
+                currentVersion = f" v{version}"
             elif ver_type == "Phigros":
-                phigros_ver = version
+                phigros_ver = f" {version}"
 
 Version: dict[Literal["ver", "phigros", "nonebot"], str] = {
     "ver": currentVersion,