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/handler/greet/user.go

@@ -0,0 +1,85 @@
+package greet
+
+import (
+	"errors"
+	"strings"
+	"time"
+
+	"honoka-chan/internal/middleware"
+	usermodel "honoka-chan/internal/model/user"
+	"honoka-chan/internal/router"
+	greetschema "honoka-chan/internal/schema/greet"
+	"honoka-chan/internal/session"
+	honokautils "honoka-chan/internal/utils"
+
+	"github.com/gin-gonic/gin"
+)
+
+func user(ctx *gin.Context) {
+	ss := session.Get(ctx)
+	defer ss.Finalize()
+
+	req := greetschema.UserReq{}
+	err := honokautils.ParseRequestData(ctx, &req)
+	if ss.CheckErr(err) {
+		return
+	}
+
+	message := strings.TrimSpace(req.Message)
+	if message == "" {
+		ss.CheckErr(errors.New("message is required"))
+		return
+	}
+	if len([]rune(message)) > 200 {
+		ss.CheckErr(errors.New("message too long"))
+		return
+	}
+
+	targetUserID, err := resolveGreetingUserID(ss, req.ToUserID)
+	if ss.CheckErr(err) {
+		return
+	}
+	if targetUserID == ss.UserID {
+		ss.CheckErr(errors.New("cannot greet self"))
+		return
+	}
+
+	replyFlag := false
+	if req.RepliedNoticeID > 0 {
+		exists, err := ss.UserEng.Table(new(usermodel.UserGreet)).
+			Where("notice_id = ?", req.RepliedNoticeID).
+			Exist()
+		if ss.CheckErr(err) {
+			return
+		}
+		if !exists {
+			ss.CheckErr(errors.New("replied notice not found"))
+			return
+		}
+		replyFlag = true
+	}
+
+	_, err = ss.UserEng.Table(new(usermodel.UserGreet)).Insert(&usermodel.UserGreet{
+		AffectorID:          ss.UserID,
+		ReceiverID:          targetUserID,
+		Message:             message,
+		Reply:               replyFlag,
+		Readed:              false,
+		DeletedFromAffector: false,
+		DeletedFromReceiver: false,
+		InsertDate:          time.Now().Unix(),
+	})
+	if ss.CheckErr(err) {
+		return
+	}
+
+	ss.Respond(greetschema.EmptyResp{
+		ResponseData: []any{},
+		ReleaseInfo:  []any{},
+		StatusCode:   200,
+	})
+}
+
+func init() {
+	router.AddHandler("main.php", "POST", "/greet/user", middleware.Common, user)
+}