feat: 新增后端模型管理，第三方快捷登录

admin/server/model/gaia/model_provider_config_extend.go

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+package gaia
+
+import "time"
+
+// ModelProviderConfig 模型提供商配置表
+type ModelProviderConfig struct {
+	Id           uint      `json:"id" form:"id" gorm:"primarykey;column:id;comment:id;"`
+	ProviderName string    `json:"provider_name" gorm:"unique;not null;column:provider_name;comment:提供商名称"`
+	Enabled      bool      `json:"enabled" gorm:"default:false;column:enabled;comment:是否开启"`
+	Models       string    `json:"models" gorm:"type:text;column:models;comment:开启的模型列表(JSON数组)"`
+	Config       string    `json:"config" gorm:"type:text;column:config;comment:额外配置(JSON)"`
+	CreatedAt    time.Time `json:"created_at" gorm:"column:created_at;comment:创建时间"`
+	UpdatedAt    time.Time `json:"updated_at" gorm:"column:updated_at;comment:更新时间"`
+}
+
+// TableName ModelProviderConfig自定义表名 model_provider_config
+func (ModelProviderConfig) TableName() string {
+	return "model_provider_config_extend"
+}
+
+// ModelProxyLog 模型中转请求日志表
+type ModelProxyLog struct {
+	Id             uint      `json:"id" form:"id" gorm:"primarykey;column:id;comment:id;"`
+	UserId         string    `json:"user_id" gorm:"type:uuid;not null;column:user_id;comment:用户ID"`
+	ProviderName   string    `json:"provider_name" gorm:"column:provider_name;comment:提供商"`
+	ModelName      string    `json:"model_name" gorm:"column:model_name;comment:模型名"`
+	RequestTokens  int       `json:"request_tokens" gorm:"column:request_tokens;comment:请求token数"`
+	ResponseTokens int       `json:"response_tokens" gorm:"column:response_tokens;comment:响应token数"`
+	Status         string    `json:"status" gorm:"column:status;comment:状态"`
+	ErrorMessage   string    `json:"error_message" gorm:"type:text;column:error_message;comment:错误信息"`
+	CreatedAt      time.Time `json:"created_at" gorm:"column:created_at;comment:创建时间"`
+}
+
+// TableName ModelProxyLog自定义表名 model_proxy_log
+func (ModelProxyLog) TableName() string {
+	return "model_proxy_log_extend"
+}

admin/server/model/gaia/model_provider_constants_extend.go

@@ -0,0 +1,41 @@
+package gaia
+
+// 模型提供商逻辑名称（列表展示与内部 key）
+const (
+	ProviderOpenai   = "openai"
+	ProviderTongyi   = "tongyi"
+	ProviderGoogle   = "google"
+	ProviderAnthropic = "anthropic"
+)
+
+// DifyProviderTypeCustom Dify providers 表 provider_type 枚举
+const DifyProviderTypeCustom = "custom"
+
+// 凭证配置中的 key 名
+const (
+	ConfigKeyOpenaiAPIKey    = "openai_api_key"
+	ConfigKeyOpenaiAPIBase   = "openai_api_base"
+	ConfigKeyDashScopeAPIKey = "dashscope_api_key"
+	ConfigKeyAPIKey          = "api_key"
+)
+
+// SupportedProviders 列表展示的提供商顺序
+var SupportedProviders = []string{ProviderOpenai, ProviderTongyi, ProviderGoogle, ProviderAnthropic}
+
+// DefaultChatCompletionsEndpoints 各提供商聊天接口默认完整 URL（兼容旧 ProxyChat）
+var DefaultChatCompletionsEndpoints = map[string]string{
+	ProviderOpenai: "https://api.openai.com/v1/chat/completions",
+	ProviderTongyi: "https://dashscope.aliyuncs.com/compatible-mode/v1/chat/completions",
+	ProviderGoogle: "https://generativelanguage.googleapis.com/v1beta/chat/completions",
+}
+
+// DefaultAPIBase 各提供商 API 根地址（无路径，用于通用代理；当 provider_credentials.encrypted_config 无 openai_api_base 时使用）
+var DefaultAPIBase = map[string]string{
+	ProviderOpenai:    "https://api.openai.com",
+	ProviderTongyi:    "https://dashscope.aliyuncs.com/compatible-mode",
+	ProviderGoogle:    "https://generativelanguage.googleapis.com",
+	ProviderAnthropic: "https://api.anthropic.com",
+}
+
+// CredentialKeyFallback 未知提供商时依次尝试的配置 key
+var CredentialKeyFallback = []string{ConfigKeyOpenaiAPIKey, ConfigKeyAPIKey, ConfigKeyDashScopeAPIKey}

admin/server/model/gaia/provider_extend.go

@@ -0,0 +1,13 @@
+package gaia
+
+import "time"
+
+type ProviderCredential struct {
+	ID              string    `json:"id" gorm:"index;comment:凭证ID"`
+	TenantID        string    `json:"tenant_id" gorm:"comment:租户ID"`
+	ProviderName    string    `json:"provider_name" gorm:"comment:提供者名称"`
+	CredentialName  string    `json:"credential_name" gorm:"comment:凭证名称"`
+	EncryptedConfig string    `json:"encrypted_config" gorm:"comment:加密配置"`
+	CreatedAt       time.Time `json:"created_at" gorm:"not null;default:CURRENT_TIMESTAMP;comment:创建时间"`
+	UpdatedAt       time.Time `json:"updated_at" gorm:"not null;default:CURRENT_TIMESTAMP;comment:更新时间"`
+}

admin/server/model/gaia/request/gaia_login.go

@@ -0,0 +1,16 @@
+package request
+
+// GaiaOAuth2LoginReq OAuth2 登录请求（code 与 access_token 二选一；Extend: access_token 兼容 casdoor implicit/hybrid）
+type GaiaOAuth2LoginReq struct {
+	Code        string `json:"code"`
+	AccessToken string `json:"access_token"` // Extend: 兼容 casdoor，无 code 时直接使用回调中的 access_token
+	RedirectURI string `json:"redirect_uri"`
+	State       string `json:"state"`
+}
+
+// GaiaDingTalkLoginReq 钉钉登录请求
+type GaiaDingTalkLoginReq struct {
+	AuthCode    string `json:"auth_code" binding:"required"`
+	RedirectURI string `json:"redirect_uri"`
+	State       string `json:"state"`
+}

admin/server/model/gaia/request/model_provider.go

@@ -0,0 +1,12 @@
+package request
+
+// ChatRequest 聊天请求（OpenAI 兼容）
+type ChatRequest struct {
+	Model       string                   `json:"model"`
+	Messages    []map[string]interface{} `json:"messages"`
+	Stream      bool                     `json:"stream"`
+	Temperature float64                  `json:"temperature,omitempty"`
+	MaxTokens   int                      `json:"max_tokens,omitempty"`
+	Tools       []map[string]interface{} `json:"tools,omitempty"`
+	ToolChoice  interface{}              `json:"tool_choice,omitempty"`
+}

admin/server/model/gaia/response/gaia_login.go

@@ -0,0 +1,13 @@
+package response
+
+import (
+	"github.com/flipped-aurora/gin-vue-admin/server/model/system"
+)
+
+// GaiaLoginResult 登录结果（含 JWT 与第三方回调参数）
+type GaiaLoginResult struct {
+	User        system.SysUser `json:"user"`
+	Token       string        `json:"token"`
+	RedirectURI string        `json:"redirect_uri,omitempty"`
+	State       string        `json:"state,omitempty"`
+}

admin/server/model/gaia/response/model_provider.go

@@ -0,0 +1,66 @@
+package response
+
+// ProviderCredentials 提供商凭证（内部/代理用）
+type ProviderCredentials struct {
+	APIKey   string `json:"api_key"`
+	Endpoint string `json:"endpoint,omitempty"`
+}
+
+// ModelInfo 模型信息
+type ModelInfo struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+// ProviderListItem 提供商列表项
+type ProviderListItem struct {
+	ProviderName    string      `json:"provider_name"`
+	Enabled         bool        `json:"enabled"`
+	Models          []string    `json:"models"`
+	AvailableModels []ModelInfo `json:"available_models"`
+}
+
+// OpenAIModelsResponse OpenAI 格式的模型列表响应
+type OpenAIModelsResponse struct {
+	Data []ModelInfo `json:"data"`
+}
+
+// OpenAIModelListItem GET /v1/models 返回的单项
+type OpenAIModelListItem struct {
+	ID string `json:"id"`
+}
+
+// OpenAIModelsListResponse GET /v1/models 接口响应
+type OpenAIModelsListResponse struct {
+	Data []OpenAIModelListItem `json:"data"`
+}
+
+// TongyiModelsListResponse 通义 GET /v1/models 返回的格式：success + output.models
+type TongyiModelsListResponse struct {
+	Success bool `json:"success"`
+	Output  struct {
+		Total   int               `json:"total"`
+		PageNo  int               `json:"page_no"`
+		PageSize int              `json:"page_size"`
+		Models  []TongyiModelItem `json:"models"`
+	} `json:"output"`
+}
+
+// TongyiModelItem 通义模型列表单项，id 为 model 字段
+type TongyiModelItem struct {
+	Model string `json:"model"`
+	Name  string `json:"name"`
+}
+
+// GeminiModelsListResponse Google Gemini GET /v1beta/models 返回：models[] + nextPageToken
+type GeminiModelsListResponse struct {
+	Models         []GeminiModelItem `json:"models"`
+	NextPageToken  string            `json:"nextPageToken"`
+}
+
+// GeminiModelItem Gemini 模型单项，name 为 "models/gemini-xxx"，baseModelId 用于请求
+type GeminiModelItem struct {
+	Name        string `json:"name"`
+	BaseModelID string `json:"baseModelId"`
+	DisplayName string `json:"displayName"`
+}