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.

tests/test_cli.py

@@ -0,0 +1,39 @@
+"""CLI 命令单元测试"""
+import pytest
+from click.testing import CliRunner
+from oss.cli import cli, version, serve
+
+
+class TestCLI:
+    """测试 CLI 命令"""
+
+    def test_version_command(self):
+        """测试版本命令"""
+        runner = CliRunner()
+        result = runner.invoke(version)
+        
+        assert result.exit_code == 0
+        assert "Future OSS" in result.output
+        assert "1.2.0" in result.output
+
+    def test_cli_help(self):
+        """测试 CLI 帮助信息"""
+        runner = CliRunner()
+        result = runner.invoke(cli, ['--help'])
+        
+        assert result.exit_code == 0
+        assert "Future OSS" in result.output
+        assert "serve" in result.output
+        assert "version" in result.output
+
+    def test_serve_command_exists(self):
+        """测试 serve 命令存在"""
+        runner = CliRunner()
+        result = runner.invoke(serve, ['--help'])
+        
+        assert result.exit_code == 0
+        assert "启动 Future OSS" in result.output
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])