feat: add 7 AI entity models + AutoMigrate

- AIProvider, AIModel, AIApiKey (platform config)
- AIConversation, AIChatMessage (chat data)
- AIUsageRecord, AIUserQuota (billing data)
- AutoMigrate updated in servicecontext.go

backend/internal/svc/servicecontext.go

@@ -64,7 +64,15 @@ func NewServiceContext(c config.Config) *ServiceContext {
 	}
 
 	// 自动迁移表
-	err = db.AutoMigrate(&model.User{}, &model.Profile{}, &model.File{}, &model.Menu{}, &model.Role{}, &model.RoleMenu{}, &model.Organization{}, &model.UserOrganization{})
+	err = db.AutoMigrate(
+		&model.User{}, &model.Profile{}, &model.File{},
+		&model.Menu{}, &model.Role{}, &model.RoleMenu{},
+		&model.Organization{}, &model.UserOrganization{},
+		// AI models
+		&model.AIProvider{}, &model.AIModel{}, &model.AIApiKey{},
+		&model.AIConversation{}, &model.AIChatMessage{},
+		&model.AIUsageRecord{}, &model.AIUserQuota{},
+	)
 	if err != nil {
 		panic("Failed to migrate database: " + err.Error())
 	}

backend/model/ai_api_key_entity.go

@@ -0,0 +1,20 @@
+package model
+
+import "time"
+
+// AIApiKey AI API密钥
+type AIApiKey struct {
+	Id         int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	ProviderId int64     `gorm:"column:provider_id;index;not null" json:"providerId"`
+	UserId     int64     `gorm:"column:user_id;index;default:0" json:"userId"`
+	KeyValue   string    `gorm:"column:key_value;type:text;not null" json:"-"`
+	IsActive   bool      `gorm:"column:is_active;default:true" json:"isActive"`
+	Remark     string    `gorm:"column:remark;type:varchar(255)" json:"remark"`
+	CreatedAt  time.Time `gorm:"column:created_at;autoCreateTime" json:"createdAt"`
+	UpdatedAt  time.Time `gorm:"column:updated_at;autoUpdateTime" json:"updatedAt"`
+}
+
+// TableName 指定表名
+func (AIApiKey) TableName() string {
+	return "ai_api_key"
+}

backend/model/ai_chat_message_entity.go

@@ -0,0 +1,21 @@
+package model
+
+import "time"
+
+// AIChatMessage AI聊天消息
+type AIChatMessage struct {
+	Id             int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	ConversationId int64     `gorm:"column:conversation_id;index;not null" json:"conversationId"`
+	Role           string    `gorm:"column:role;type:varchar(20);not null" json:"role"`
+	Content        string    `gorm:"column:content;type:longtext" json:"content"`
+	TokenCount     int       `gorm:"column:token_count;default:0" json:"tokenCount"`
+	Cost           float64   `gorm:"column:cost;type:decimal(10,6);default:0" json:"cost"`
+	ModelId        string    `gorm:"column:model_id;type:varchar(100)" json:"modelId"`
+	LatencyMs      int       `gorm:"column:latency_ms;default:0" json:"latencyMs"`
+	CreatedAt      time.Time `gorm:"column:created_at;autoCreateTime" json:"createdAt"`
+}
+
+// TableName 指定表名
+func (AIChatMessage) TableName() string {
+	return "ai_chat_message"
+}

backend/model/ai_conversation_entity.go

@@ -0,0 +1,22 @@
+package model
+
+import "time"
+
+// AIConversation AI对话
+type AIConversation struct {
+	Id          int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	UserId      int64     `gorm:"column:user_id;index;not null" json:"userId"`
+	Title       string    `gorm:"column:title;type:varchar(200);default:'新对话'" json:"title"`
+	ModelId     string    `gorm:"column:model_id;type:varchar(100)" json:"modelId"`
+	ProviderId  int64     `gorm:"column:provider_id;default:0" json:"providerId"`
+	TotalTokens int64     `gorm:"column:total_tokens;default:0" json:"totalTokens"`
+	TotalCost   float64   `gorm:"column:total_cost;type:decimal(10,6);default:0" json:"totalCost"`
+	IsArchived  bool      `gorm:"column:is_archived;default:false" json:"isArchived"`
+	CreatedAt   time.Time `gorm:"column:created_at;autoCreateTime" json:"createdAt"`
+	UpdatedAt   time.Time `gorm:"column:updated_at;autoUpdateTime" json:"updatedAt"`
+}
+
+// TableName 指定表名
+func (AIConversation) TableName() string {
+	return "ai_conversation"
+}

backend/model/ai_model_entity.go

@@ -0,0 +1,26 @@
+package model
+
+import "time"
+
+// AIModel AI模型配置
+type AIModel struct {
+	Id             int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	ProviderId     int64     `gorm:"column:provider_id;index;not null" json:"providerId"`
+	ModelId        string    `gorm:"column:model_id;type:varchar(100);not null" json:"modelId"`
+	DisplayName    string    `gorm:"column:display_name;type:varchar(100)" json:"displayName"`
+	InputPrice     float64   `gorm:"column:input_price;type:decimal(10,6);default:0" json:"inputPrice"`
+	OutputPrice    float64   `gorm:"column:output_price;type:decimal(10,6);default:0" json:"outputPrice"`
+	MaxTokens      int       `gorm:"column:max_tokens;default:4096" json:"maxTokens"`
+	ContextWindow  int       `gorm:"column:context_window;default:128000" json:"contextWindow"`
+	SupportsStream bool      `gorm:"column:supports_stream;default:true" json:"supportsStream"`
+	SupportsVision bool      `gorm:"column:supports_vision;default:false" json:"supportsVision"`
+	IsActive       bool      `gorm:"column:is_active;default:true" json:"isActive"`
+	SortOrder      int       `gorm:"column:sort_order;default:0" json:"sortOrder"`
+	CreatedAt      time.Time `gorm:"column:created_at;autoCreateTime" json:"createdAt"`
+	UpdatedAt      time.Time `gorm:"column:updated_at;autoUpdateTime" json:"updatedAt"`
+}
+
+// TableName 指定表名
+func (AIModel) TableName() string {
+	return "ai_model"
+}

backend/model/ai_provider_entity.go

@@ -0,0 +1,22 @@
+package model
+
+import "time"
+
+// AIProvider AI供应商模型
+type AIProvider struct {
+	Id          int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	Name        string    `gorm:"column:name;type:varchar(50);uniqueIndex;not null" json:"name"`
+	DisplayName string    `gorm:"column:display_name;type:varchar(100);not null" json:"displayName"`
+	BaseUrl     string    `gorm:"column:base_url;type:varchar(255)" json:"baseUrl"`
+	SdkType     string    `gorm:"column:sdk_type;type:varchar(20);default:'openai_compat'" json:"sdkType"`
+	Protocol    string    `gorm:"column:protocol;type:varchar(20);default:'openai'" json:"protocol"`
+	IsActive    bool      `gorm:"column:is_active;default:true" json:"isActive"`
+	SortOrder   int       `gorm:"column:sort_order;default:0" json:"sortOrder"`
+	CreatedAt   time.Time `gorm:"column:created_at;autoCreateTime" json:"createdAt"`
+	UpdatedAt   time.Time `gorm:"column:updated_at;autoUpdateTime" json:"updatedAt"`
+}
+
+// TableName 指定表名
+func (AIProvider) TableName() string {
+	return "ai_provider"
+}

backend/model/ai_usage_record_entity.go

@@ -0,0 +1,24 @@
+package model
+
+import "time"
+
+// AIUsageRecord AI使用记录
+type AIUsageRecord struct {
+	Id           int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	UserId       int64     `gorm:"column:user_id;index;not null" json:"userId"`
+	ProviderId   int64     `gorm:"column:provider_id;index" json:"providerId"`
+	ModelId      string    `gorm:"column:model_id;type:varchar(100)" json:"modelId"`
+	InputTokens  int       `gorm:"column:input_tokens;default:0" json:"inputTokens"`
+	OutputTokens int       `gorm:"column:output_tokens;default:0" json:"outputTokens"`
+	Cost         float64   `gorm:"column:cost;type:decimal(10,6);default:0" json:"cost"`
+	ApiKeyId     int64     `gorm:"column:api_key_id;default:0" json:"apiKeyId"`
+	Status       string    `gorm:"column:status;type:varchar(20);default:'ok'" json:"status"`
+	LatencyMs    int       `gorm:"column:latency_ms;default:0" json:"latencyMs"`
+	ErrorMessage string    `gorm:"column:error_message;type:text" json:"errorMessage"`
+	CreatedAt    time.Time `gorm:"column:created_at;autoCreateTime" json:"createdAt"`
+}
+
+// TableName 指定表名
+func (AIUsageRecord) TableName() string {
+	return "ai_usage_record"
+}

backend/model/ai_user_quota_entity.go

@@ -0,0 +1,19 @@
+package model
+
+import "time"
+
+// AIUserQuota AI用户额度
+type AIUserQuota struct {
+	Id             int64     `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	UserId         int64     `gorm:"column:user_id;uniqueIndex;not null" json:"userId"`
+	Balance        float64   `gorm:"column:balance;type:decimal(10,4);default:0" json:"balance"`
+	TotalRecharged float64   `gorm:"column:total_recharged;type:decimal(10,4);default:0" json:"totalRecharged"`
+	TotalConsumed  float64   `gorm:"column:total_consumed;type:decimal(10,4);default:0" json:"totalConsumed"`
+	FrozenAmount   float64   `gorm:"column:frozen_amount;type:decimal(10,4);default:0" json:"frozenAmount"`
+	UpdatedAt      time.Time `gorm:"column:updated_at;autoUpdateTime" json:"updatedAt"`
+}
+
+// TableName 指定表名
+func (AIUserQuota) TableName() string {
+	return "ai_user_quota"
+}