refactor(routes):

- keep install-mode root redirect to /install and add tests covering install root redirect and install page serving
- change root backend handler from Any("/") to POST("/") so GET / can consistently serve the SPA after install

Co-authored-by: Copilot <copilot@github.com>

src/route/router.go

@@ -22,7 +22,7 @@ import (
 
 // RegisterRoute 路由注册
 func RegisterRoute(e *echo.Echo) {
-	e.Any("/", func(c echo.Context) error {
+	e.POST("/", func(c echo.Context) error {
 		return c.String(http.StatusOK, "hello epusdt, https://github.com/GMwalletApp/epusdt")
 	})
 

src/route/router_test.go

@@ -167,6 +167,21 @@ func doFormPost(e *echo.Echo, path string, values url.Values) *httptest.Response
 	return rec
 }
 
+func TestRootPostRoute(t *testing.T) {
+	e := setupTestEnv(t)
+
+	req := httptest.NewRequest(http.MethodPost, "/", nil)
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", rec.Code)
+	}
+	if body := rec.Body.String(); body != "hello epusdt, https://github.com/GMwalletApp/epusdt" {
+		t.Fatalf("unexpected body: %q", body)
+	}
+}
+
 // TestCreateOrderGmpayV1Solana tests the gmpay route with solana network.
 func TestCreateOrderGmpayV1Solana(t *testing.T) {
 	e := setupTestEnv(t)