refactor: restructure project layout and add install.mjs

- Move src/ → plugin/ with subdirectories:
  - plugin/core/ (business logic, models, store, permissions, utils, memory)
  - plugin/tools/ (query, resources)
  - plugin/commands/ (placeholder for slash commands)
  - plugin/hooks/ (placeholder for lifecycle hooks)
  - plugin/index.ts (wiring layer only, no business logic)
- Add install.mjs with --install, --uninstall, --openclaw-profile-path
- Add skills/ and docs/ root directories
- Move planning docs (PLAN.md, FEAT.md, AGENT_TASKS.md) to docs/
- Remove old scripts/install.sh
- Update tsconfig rootDir: src → plugin
- Update README.md and README.zh.md with new layout
- Bump version to 0.2.0
- All tests pass

scripts/demo.ts

@@ -1,6 +1,6 @@
 import path from 'node:path';
 import fs from 'node:fs';
-import { Yonexus } from '../src/index';
+import { Yonexus } from '../plugin/index';
 
 const dataFile = path.resolve(process.cwd(), 'data/demo-org.json');
 if (fs.existsSync(dataFile)) fs.unlinkSync(dataFile);

scripts/install.sh

@@ -1,21 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# Yonexus install script
-# - Registers plugin name: yonexus
-# - Places build output in dist/yonexus
-
-ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
-DIST_DIR="$ROOT_DIR/dist/yonexus"
-
-cd "$ROOT_DIR"
-
-if [ ! -d node_modules ]; then
-  npm install
-fi
-
-npm run build
-mkdir -p "$DIST_DIR"
-cp -f "$ROOT_DIR/plugin.json" "$DIST_DIR/plugin.json"
-
-echo "[yonexus] install complete -> $DIST_DIR"