Overhaul [1/n]

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/schema/announce/checkstate.go

@@ -0,0 +1,12 @@
+package announce
+
+type CheckStateData struct {
+	HasUnreadAnnounce bool  `json:"has_unread_announce"`
+	ServerTimestamp   int64 `json:"server_timestamp"`
+}
+
+type CheckStateDataResp struct {
+	ResponseData CheckStateData `json:"response_data"`
+	ReleaseInfo  []any          `json:"release_info"`
+	StatusCode   int            `json:"status_code"`
+}