feat: reorganize to standard OpenClaw plugin structure

New structure:
├── package.json                 # Root package
├── README.md                    # Documentation
├── plugin/                      # OpenClaw plugin
│   ├── openclaw.plugin.json     # Plugin manifest
│   ├── index.ts                 # Plugin entry (TypeScript)
│   ├── package.json
│   └── tsconfig.json
├── server/                      # Telemetry sidecar
│   └── telemetry.mjs
├── skills/                      # OpenClaw skills
└── scripts/
    └── install.mjs              # Installation script

Matches PaddedCell project structure.
Provides install.mjs with build/install/configure/uninstall commands.

plugin/tsconfig.json

@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "esModuleInterop": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "outDir": "./",
+    "rootDir": "./",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["*.ts"],
+  "exclude": ["node_modules"]
+}