feat: KBDB-graph 插件獨立 — 全面改寫成走基本盤 API（API-as-Wall）

按 leo 鐵律（2026-06-14）把插件從「直接 SQL 操作基本盤表」改寫成
「只透過基本盤 arcrun/kbdb HTTP API 讀寫」。零建表、零 migration、零 SQL。

- 新增 src/lib/kbdb-client.ts：唯一對外通道，封裝 entries/templates/records API
- 新增 src/lib/templates.ts：triplet/entity template 定義（替代建表）
- 改寫 21 個違規 action（triplet/graph/entity/search）→ 走 client，圖在插件層記憶體組裝
- 移除所有 migrations、D1/Vectorize/AI 綁定；embedding/語意搜尋歸基本盤 optional 模組
- index.ts 只掛 triplets/graph/entities/search 路由；基本盤路由歸 arcrun/kbdb
- 測試改走 mock client（純 node）；裁剪 CLAUDE.md 只留 graph 插件 + 鐵律
- 修正 SDD design.md「讀現狀推翻鐵律」的錯誤判斷（共用 D1 → API-as-Wall）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "kbdb-graph-plugin",
+  "version": "0.6.0",
+  "private": true,
+  "description": "KBDB-graph 插件：triplet 採集 + graph 查詢，掛在基本盤 arcrun/kbdb 之上（API-as-Wall，零建表/零 SQL）",
+  "scripts": {
+    "dev": "wrangler dev",
+    "deploy": "wrangler deploy",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "dependencies": {
+    "@hono/swagger-ui": "^0.6.1",
+    "@hono/zod-openapi": "^1.2.4",
+    "hono": "^4.7.0",
+    "zod": "^4.3.6"
+  },
+  "devDependencies": {
+    "@cloudflare/workers-types": "^4.20250219.0",
+    "typescript": "^5.7.0",
+    "vitest": "^3.1.0"
+  }
+}