fix (memory/search): support unicode tokens in FTS query builder

src/memory/hybrid.test.ts

@@ -5,6 +5,8 @@ describe("memory hybrid helpers", () => {
   it("buildFtsQuery tokenizes and AND-joins", () => {
     expect(buildFtsQuery("hello world")).toBe('"hello" AND "world"');
     expect(buildFtsQuery("FOO_bar baz-1")).toBe('"FOO_bar" AND "baz" AND "1"');
+    expect(buildFtsQuery("金银价格")).toBe('"金银价格"');
+    expect(buildFtsQuery("価格 2026年")).toBe('"価格" AND "2026年"');
     expect(buildFtsQuery("   ")).toBeNull();
   });
 

src/memory/hybrid.ts

@@ -23,7 +23,7 @@ export type HybridKeywordResult = {
 export function buildFtsQuery(raw: string): string | null {
   const tokens =
     raw
-      .match(/[A-Za-z0-9_]+/g)
+      .match(/[\p{L}\p{N}_]+/gu)
       ?.map((t) => t.trim())
       .filter(Boolean) ?? [];
   if (tokens.length === 0) {