refactor: shorten model and table prefixes

backend/internal/models/ai_expert_category.go

@@ -2,8 +2,8 @@ package models
 
 import "time"
 
-// SenlinAgentAIExpertCategory groups experts from the local expert catalog.
-type SenlinAgentAIExpertCategory struct {
+// SaAIExpertCategory groups experts from the local expert catalog.
+type SaAIExpertCategory struct {
 	ID        uint   `gorm:"primaryKey"`
 	Identity  string `gorm:"type:char(36);uniqueIndex"`
 	Slug      string `gorm:"size:80;uniqueIndex;not null"`
@@ -12,6 +12,6 @@ type SenlinAgentAIExpertCategory struct {
 	UpdatedAt time.Time
 }
 
-func (SenlinAgentAIExpertCategory) TableName() string {
-	return "senlin_agent_ai_expert_categories"
+func (SaAIExpertCategory) TableName() string {
+	return "sa_ai_expert_categories"
 }