✨ feat(ui): add incremental-add feedback & translations for model lists (#1218)

Front-end enhancements around “Add custom models”:

• EditChannel.js / EditTagModal.js
  – Skip models that already exist instead of blocking the action.
  – Collect actually inserted items and display:
      • Success toast: “Added N models: model1, model2 …”
      • Info toast when no new model detected.
  – Keeps UX smooth while preserving deduplication logic.

• i18n
  – en.json: added keys
      • "已新增 {{count}} 个模型：{{list}}"
      • "未发现新增模型"
  – Fixed a broken JSON string containing smart quotes to maintain valid syntax.

Result:
Users can bulk-paste model names; duplicates are silently ignored and the UI clearly lists what was incrementally appended. All messages are fully internationalised.

Closes #1218

model/ability.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/samber/lo"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
 type Ability struct {
@@ -158,7 +159,7 @@ func (channel *Channel) AddAbilities() error {
 		return nil
 	}
 	for _, chunk := range lo.Chunk(abilities, 50) {
-		err := DB.Create(&chunk).Error
+		err := DB.Clauses(clause.OnConflict{DoNothing: true}).Create(&chunk).Error
 		if err != nil {
 			return err
 		}
@@ -224,7 +225,7 @@ func (channel *Channel) UpdateAbilities(tx *gorm.DB) error {
 
 	if len(abilities) > 0 {
 		for _, chunk := range lo.Chunk(abilities, 50) {
-			err = tx.Create(&chunk).Error
+			err = tx.Clauses(clause.OnConflict{DoNothing: true}).Create(&chunk).Error
 			if err != nil {
 				if isNewTx {
 					tx.Rollback()