fix: bugs in bootstrap

* 修复bug：UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 1487: illegal multibyte sequence
方法：指定编码。pipeline_config = json.load(open('templates/default-pipeline-config.json', encoding='utf-8'))

* Create 1

* Delete plugins /1

* 修复：FileNotFoundError: [WinError 3] 系统找不到指定的路径。: 'plugins'

* 优化插件依赖检查逻辑，移除创建plugins目录的代码

pkg/core/bootutils/deps.py

@@ -61,9 +61,11 @@ async def install_deps(deps: list[str]):
 async def precheck_plugin_deps():
     print('[Startup] Prechecking plugin dependencies...')
 
-    for dir in os.listdir("plugins"):
-        subdir = os.path.join("plugins", dir)
-        if not os.path.isdir(subdir):
-            continue
-        if 'requirements.txt' in os.listdir(subdir):
-            pkgmgr.install_requirements(os.path.join(subdir, 'requirements.txt'), extra_params=['-q', '-q', '-q'])
+    # 只有在plugins目录存在时才执行插件依赖安装
+    if os.path.exists("plugins"):
+        for dir in os.listdir("plugins"):
+            subdir = os.path.join("plugins", dir)
+            if not os.path.isdir(subdir):
+                continue
+            if 'requirements.txt' in os.listdir(subdir):
+                pkgmgr.install_requirements(os.path.join(subdir, 'requirements.txt'), extra_params=['-q', '-q', '-q'])