Update plan and add install script

PLAN.md

@@ -89,7 +89,32 @@ Query example:
 - better query pagination & filtering
 - management commands & validation
 
-## 9) Notes & Decisions
+## 9) Project Structure (recommended)
+```
+openclaw-plugin-yonexus/
+├─ plugin.json
+├─ src/
+│  ├─ index.ts
+│  ├─ store/        # in-memory + JSON persistence
+│  ├─ models/
+│  ├─ permissions/
+│  ├─ tools/
+│  ├─ memory/
+│  └─ utils/
+├─ scripts/
+│  └─ install.sh
+├─ dist/
+│  └─ yonexus/      # build output target
+└─ data/
+   └─ org.json
+```
+
+## 10) Install Script Requirement
+- Provide `scripts/install.sh`
+- It should register the OpenClaw plugin name as **`yonexus`**
+- Build artifacts must be placed into **`dist/yonexus`**
+
+## 11) Notes & Decisions
 - Structure data is not stored in memory_store.
 - Shared memory uses memory_store (compatible with memory-lancedb-pro).
 - Queryable fields are whitelisted via schema.