Title: Implement minimal core framework with PL injection and update build config

Key features implemented:
- Updated package metadata and dependencies in PKG-INFO, setup files
- Added main.py entry point for backward compatibility with README launch method
- Enhanced CLI with config options, system info command, and proper signal handling
- Implemented minimal PluginManager loading only plugin-loader core plugin
- Refactored PluginLoader to follow minimal core design, removed sandbox/isolation complexity
- Updated auto-dependency plugin with safer PL injection mechanism and disabled pl_injection
- Removed legacy plugin files (firewall, frp_proxy, ftp_server, multi_lang_deploy, ops_toolbox, security_gateway) as functionality moved to core plugin system
- Improved gitignore with comprehensive ignore patterns

The changes implement a minimal core framework design where only the plugin-loader is directly loaded by the core, with all other plugins managed through the PL injection mechanism, significantly simplifying the architecture.

store/@{FutureOSS}/plugin-loader-pro/core/proxy.py

@@ -0,0 +1,36 @@
+"""插件代理 - 防越级访问"""
+
+
+class PermissionError(Exception):
+    """权限错误"""
+    pass
+
+
+class PluginProxy:
+    """插件代理"""
+
+    def __init__(self, plugin_name: str, plugin_instance: any,
+                 allowed_plugins: list[str], all_plugins: dict[str, dict]):
+        self._plugin_name = plugin_name
+        self._plugin_instance = plugin_instance
+        self._allowed_plugins = set(allowed_plugins)
+        self._all_plugins = all_plugins
+
+    def get_plugin(self, name: str) -> any:
+        """获取其他插件实例（带权限检查）"""
+        if name not in self._allowed_plugins and "*" not in self._allowed_plugins:
+            raise PermissionError(
+                f"插件 '{self._plugin_name}' 无权访问插件 '{name}'"
+            )
+        if name not in self._all_plugins:
+            return None
+        return self._all_plugins[name]["instance"]
+
+    def list_plugins(self) -> list[str]:
+        """列出有权限访问的插件"""
+        if "*" in self._allowed_plugins:
+            return list(self._all_plugins.keys())
+        return [n for n in self._allowed_plugins if n in self._all_plugins]
+
+    def __getattr__(self, name: str):
+        return getattr(self._plugin_instance, name)