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}/hot-reload/manifest.json

@@ -0,0 +1,18 @@
+{
+  "metadata": {
+    "name": "hot-reload",
+    "version": "1.0.0",
+    "author": "FutureOSS",
+    "description": "热插拔 - 运行时加载/卸载/更新插件",
+    "type": "utility"
+  },
+  "config": {
+    "enabled": true,
+    "args": {
+      "watch_dirs": ["store"],
+      "watch_extensions": [".py", ".json"]
+    }
+  },
+  "dependencies": [],
+  "permissions": ["plugin-loader"]
+}