fix: 补全 IP2Location 中国城市中文映射并按省消歧

Co-authored-by: Cursor <cursoragent@cursor.com>

service/geo_zh_test.go

@@ -0,0 +1,140 @@
+package service
+
+import "testing"
+
+func TestApplyGeoZh_Huainan(t *testing.T) {
+	g := &GeoInfo{Country: "CN", Region: "Anhui", City: "Huainan", ASN: 4134, ASOrg: "Chinanet"}
+	ApplyGeoZh(g)
+	if g.Region != "安徽" || g.RegionISO != "AH" {
+		t.Fatalf("region=%q iso=%q", g.Region, g.RegionISO)
+	}
+	if g.City != "淮南" {
+		t.Fatalf("city=%q want 淮南", g.City)
+	}
+	if g.ASOrg != "中国电信" {
+		t.Fatalf("as_org=%q", g.ASOrg)
+	}
+}
+
+func TestApplyGeoZh_AmbiguousSuzhou(t *testing.T) {
+	js := &GeoInfo{Country: "CN", Region: "Jiangsu", City: "Suzhou"}
+	ApplyGeoZh(js)
+	if js.City != "苏州" {
+		t.Fatalf("jiangsu suzhou=%q", js.City)
+	}
+	ah := &GeoInfo{Country: "CN", Region: "Anhui", City: "Suzhou"}
+	ApplyGeoZh(ah)
+	if ah.City != "宿州" {
+		t.Fatalf("anhui suzhou=%q", ah.City)
+	}
+}
+
+func TestApplyGeoZh_AmbiguousTaizhouFuzhouYichunYulin(t *testing.T) {
+	cases := []struct {
+		region, city, want string
+	}{
+		{"Jiangsu", "Taizhou", "泰州"},
+		{"Zhejiang", "Taizhou", "台州"},
+		{"Fujian", "Fuzhou", "福州"},
+		{"Jiangxi", "Fuzhou", "抚州"},
+		{"Heilongjiang", "Yichun", "伊春"},
+		{"Jiangxi", "Yichun", "宜春"},
+		{"Guangxi Zhuangzu", "Yulin", "玉林"},
+		{"Shaanxi", "Yulin", "榆林"},
+		{"Gansu", "Longnan", "陇南"},
+		{"Jiangxi", "Longnan", "龙南"},
+		{"Shanxi", "Jincheng", "晋城"},
+		{"Kinmen", "Jincheng", "金城"},
+	}
+	for _, c := range cases {
+		g := &GeoInfo{Country: "CN", Region: c.region, City: c.city}
+		if c.region == "Kinmen" {
+			g.Country = "TW"
+		}
+		ApplyGeoZh(g)
+		if g.City != c.want {
+			t.Fatalf("%s %s → %q want %q", c.region, c.city, g.City, c.want)
+		}
+	}
+}
+
+func TestApplyGeoZh_Aliases(t *testing.T) {
+	for _, city := range []string{"Xi'an", "Xian", "xi'an"} {
+		g := &GeoInfo{Country: "CN", Region: "Shaanxi", City: city}
+		ApplyGeoZh(g)
+		if g.City != "西安" {
+			t.Fatalf("%q → %q", city, g.City)
+		}
+	}
+	g := &GeoInfo{Country: "CN", Region: "Jiangsu", City: "Huai'an"}
+	ApplyGeoZh(g)
+	if g.City != "淮安" {
+		t.Fatalf("Huai'an → %q", g.City)
+	}
+}
+
+func TestApplyGeoZh_NonCNUnchanged(t *testing.T) {
+	g := &GeoInfo{Country: "US", Region: "California", City: "San Francisco"}
+	ApplyGeoZh(g)
+	if g.City != "San Francisco" || g.Region != "California" {
+		t.Fatalf("got region=%q city=%q", g.Region, g.City)
+	}
+}
+
+func TestApplyGeoZh_RegionAliases(t *testing.T) {
+	g := &GeoInfo{Country: "CN", Region: "Guangxi Zhuangzu", City: "Nanning"}
+	ApplyGeoZh(g)
+	if g.Region != "广西" || g.RegionISO != "GX" || g.City != "南宁" {
+		t.Fatalf("got %+v", g)
+	}
+	g2 := &GeoInfo{Country: "CN", Region: "Xinjiang Uygur", City: "Kashgar"}
+	ApplyGeoZh(g2)
+	if g2.Region != "新疆" || g2.City != "喀什" {
+		t.Fatalf("got %+v", g2)
+	}
+}
+
+func TestApplyGeoZh_CitySuffix(t *testing.T) {
+	g := &GeoInfo{Country: "CN", Region: "Anhui", City: "Huainan City"}
+	ApplyGeoZh(g)
+	if g.City != "淮南" {
+		t.Fatalf("city=%q", g.City)
+	}
+}
+
+func TestLookupCityZh_FallbackWithoutRegion(t *testing.T) {
+	zh, ok := lookupCityZh("", "", "Suzhou")
+	if !ok || zh != "苏州" {
+		t.Fatalf("fallback suzhou=%q ok=%v", zh, ok)
+	}
+}
+
+func TestApplyGeoZh_LiteCNCitiesCoverage(t *testing.T) {
+	var missing []string
+	for _, row := range liteCNCities {
+		country := "CN"
+		rk := row.region
+		switch rk {
+		case "Hong Kong":
+			country = "HK"
+		case "Macao":
+			country = "MO"
+		case "Changhua", "Chiayi", "Hsinchu", "Hualien", "Kaohsiung", "Keelung",
+			"Kinmen", "Lienchiang", "Miaoli", "Nantou", "New Taipei", "Penghu",
+			"Pingtung", "Taichung", "Tainan", "Taipei", "Taitung", "Taoyuan",
+			"Yilan", "Yunlin":
+			country = "TW"
+		}
+		g := &GeoInfo{Country: country, Region: row.region, City: row.city}
+		ApplyGeoZh(g)
+		if g.City == "" || g.City == row.city {
+			// 仍为英文原文则未映射（中文不应等于英文，除非本身就是纯 ASCII 且已是目标——LITE 全是拼音）
+			if g.City == row.city {
+				missing = append(missing, row.region+"/"+row.city+"→"+g.City)
+			}
+		}
+	}
+	if len(missing) > 0 {
+		t.Fatalf("未中文化 %d 条，示例: %v", len(missing), missing[:min(20, len(missing))])
+	}
+}