feat(backend): 出入库编码搜索双路匹配+建单填快照；finance 趋势/日期区间；partner/product 拼音搜索

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

backend/internal/handler/partner_test.go

@@ -205,6 +205,33 @@ func TestPartnerHandler_List_KeywordSearch(t *testing.T) {
 	assert.Equal(t, float64(0), resp["total"].(float64))
 }
 
+// 拼音/联系人搜索（原型口径：名称 / 拼音 / 联系人）：Create 时自动生成拼音列
+func TestPartnerHandler_List_PinyinAndContactSearch(t *testing.T) {
+	db := testutil.SetupTestDB()
+	shop := testutil.CreateTestShop(db, "PT006B")
+	user := testutil.CreateTestUser(db, shop.ID, "admin", "pass", "admin")
+	token := getAuthToken(user.ID, shop.ID, "admin")
+	r := setupProtectedRouter(db)
+
+	makeRequest(r, "POST", "/api/v1/partners", token, map[string]interface{}{
+		"name": "茅台华东总代", "type": "supplier", "contact": "张伟",
+	})
+	makeRequest(r, "POST", "/api/v1/partners", token, map[string]interface{}{
+		"name": "鼎丰超市", "type": "customer", "contact": "王芳",
+	})
+
+	for kw, want := range map[string]float64{
+		"maotai":   1, // 全拼
+		"mthdzd":   1, // 首字母
+		"张伟":       1, // 联系人
+		"dingfeng": 1,
+		"buxiang":  0,
+	} {
+		w := makeRequest(r, "GET", "/api/v1/partners?keyword="+kw, token, nil)
+		assert.Equal(t, want, parseResponse(w)["total"].(float64), "keyword=%s", kw)
+	}
+}
+
 // 下拉需一次取全部：请求大页（>默认 20）应返回全部，而非被 ValidatePageSize
 // 回退到默认 20（超上限即返回默认值的历史坑）。
 func TestPartnerHandler_List_LargePageSizeReturnsAll(t *testing.T) {