feat: 新增脚手架/开发模式/权限白名单/system-monitor插件

- nebula create mod/key/list-templates 模组脚手架
- nebula dev 开发模式热重载
- manifest permissions.imports 权限白名单机制
- system-monitor 系统监控仪表盘插件
- 默认端口统一为 10086
- 修复 _init_nbpf 误读 Ed25519 私钥为 RSA 的 bug
- 更新 README.md 文档

system-monitor/manifest.json

@@ -0,0 +1,45 @@
+{
+  "name": "@NebulaShell/system-monitor",
+  "version": "0.1.0",
+  "description": "实时系统监控：CPU/内存/磁盘/网络/进程TOP，提供HTTP仪表盘和REST API",
+  "author": "NebulaShell",
+  "license": "MIT",
+  "type": "tool",
+  "main": "main.py",
+  "enabled": true,
+  "priority": 999,
+  "runtime": {
+    "language": "python",
+    "entry_point": "main.py",
+    "requirements": [
+      "psutil>=5.8.0"
+    ]
+  },
+  "capabilities": [
+    "monitoring"
+  ],
+  "services": {
+    "provides": [
+      "system-monitor"
+    ],
+    "consumes": []
+  },
+  "config": {
+    "port": 10087,
+    "host": "0.0.0.0",
+    "interval": 5,
+    "max_history": 60
+  },
+  "permissions": {
+    "imports": [
+      "os",
+      "threading",
+      "json",
+      "time",
+      "collections",
+      "http",
+      "urllib",
+      "psutil"
+    ]
+  }
+}