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>

src/routes/graph.ts

@@ -0,0 +1,49 @@
+// 圖遍歷路由入口
+// 僅驗證參數，呼叫 actions（actions 走基本盤 API，圖在插件層組裝）
+
+import { Hono } from 'hono';
+import type { Bindings } from '../types';
+import { traverseGraph, queryRelation } from '../actions/graph-traverse';
+import { getNodeEdges, getNeighbors } from '../actions/graph-nodes';
+import { findShortestPath } from '../actions/graph-path';
+import { makeKbdbClient } from '../lib/kbdb-client';
+
+const graphRoutes = new Hono<{ Bindings: Bindings }>();
+
+graphRoutes.get('/traverse', async (c) => {
+  const start = c.req.query('start');
+  if (!start) return c.json({ error: 'start parameter required' }, 400);
+  const depth = Number(c.req.query('depth') ?? 2);
+  const results = await traverseGraph(makeKbdbClient(c.env), start, depth);
+  return c.json({ start, depth, nodes: results, nodeCount: results.length });
+});
+
+graphRoutes.get('/relation', async (c) => {
+  const from = c.req.query('from');
+  const to = c.req.query('to');
+  if (!from || !to) return c.json({ error: 'from and to parameters required' }, 400);
+  const relations = await queryRelation(makeKbdbClient(c.env), from, to);
+  return c.json({ from, to, relations, count: relations.length });
+});
+
+// GET /graph/neighbors/:name — 合併原 nodes/:name 的 edges + neighbors
+graphRoutes.get('/neighbors/:name', async (c) => {
+  const name = decodeURIComponent(c.req.param('name'));
+  const client = makeKbdbClient(c.env);
+  const [edges, neighbors] = await Promise.all([
+    getNodeEdges(client, name),
+    getNeighbors(client, name),
+  ]);
+  return c.json({ node: name, edges, neighbors, edgeCount: edges.length, neighborCount: neighbors.length });
+});
+
+// GET /graph/path — 取代 /shortest-path，行為不變
+graphRoutes.get('/path', async (c) => {
+  const from = c.req.query('from');
+  const to = c.req.query('to');
+  if (!from || !to) return c.json({ error: 'from and to parameters required' }, 400);
+  const result = await findShortestPath(makeKbdbClient(c.env), from, to);
+  return c.json({ from, to, ...result });
+});
+
+export { graphRoutes };