fix(api): relax account password validation

backend/api/internal/initdb/platform_test.go

@@ -32,3 +32,19 @@ func TestInitPlatformAccessSeedsRootRole(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+func TestPlatformRootPassword(t *testing.T) {
+	t.Run("accepts six character environment password", func(t *testing.T) {
+		t.Setenv("HEQI_PLATFORM_ROOT_PASSWORD", "123456")
+		if got := platformRootPassword(); got != "123456" {
+			t.Fatalf("platformRootPassword() = %q, want environment password", got)
+		}
+	})
+
+	t.Run("falls back when environment password is too short", func(t *testing.T) {
+		t.Setenv("HEQI_PLATFORM_ROOT_PASSWORD", "12345")
+		if got := platformRootPassword(); got != PlatformRootPassword {
+			t.Fatalf("platformRootPassword() = %q, want default password", got)
+		}
+	})
+}