Implement greet inbox and outbox

- Add user_greet model and startup table sync
- Implement /greet/user and /greet/delete handlers
- Implement noticeFriendGreeting inbox and noticeUserGreetingHistory outbox
- Return peer profile and center unit info for greeting notices
- Update login topInfo friend greet counters from unread inbox messages

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

internal/schema/greet/common.go

@@ -0,0 +1,7 @@
+package greetschema
+
+type EmptyResp struct {
+	ResponseData []any `json:"response_data"`
+	ReleaseInfo  []any `json:"release_info"`
+	StatusCode   int   `json:"status_code"`
+}