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/SIGNATURE

@@ -0,0 +1,8 @@
+{
+  "signature": "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",
+  "signer": "FutureOSS",
+  "algorithm": "RSA-SHA256",
+  "timestamp": 1775964226.5213168,
+  "plugin_hash": "bed620b64c10798828613a45e3227a7849a9a450e471dfd009135354fb650a1e",
+  "author": "FutureOSS"
+}