feat: implement conversation CRUD + model list + quota logic

- Conversation list/create/get/update/delete (user-scoped)
- Model list with provider names
- Quota info (ensure + return balance)

backend/internal/logic/ai/aiconversationcreatelogic.go

@@ -5,9 +5,11 @@ package ai
 
 import (
 	"context"
+	"errors"
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +30,41 @@ func NewAiConversationCreateLogic(ctx context.Context, svcCtx *svc.ServiceContex
 }
 
 func (l *AiConversationCreateLogic) AiConversationCreate(req *types.AIConversationCreateRequest) (resp *types.AIConversationInfo, err error) {
-	// todo: add your logic here and delete this line
+	userId, _ := l.ctx.Value("userId").(int64)
+	if userId == 0 {
+		return nil, errors.New("unauthorized")
+	}
+
+	title := req.Title
+	if title == "" {
+		title = "新对话"
+	}
+
+	conv := &model.AIConversation{
+		UserId:  userId,
+		Title:   title,
+		ModelId: req.ModelId,
+	}
+
+	// Look up model to get provider ID
+	if req.ModelId != "" {
+		aiModel, err := model.AIModelFindByModelId(l.ctx, l.svcCtx.DB, req.ModelId)
+		if err == nil {
+			conv.ProviderId = aiModel.ProviderId
+		}
+	}
+
+	_, err = model.AIConversationInsert(l.ctx, l.svcCtx.DB, conv)
+	if err != nil {
+		return nil, err
+	}
 
-	return
+	return &types.AIConversationInfo{
+		Id:         conv.Id,
+		Title:      conv.Title,
+		ModelId:    conv.ModelId,
+		ProviderId: conv.ProviderId,
+		CreatedAt:  conv.CreatedAt.Format("2006-01-02 15:04:05"),
+		UpdatedAt:  conv.UpdatedAt.Format("2006-01-02 15:04:05"),
+	}, nil
 }

backend/internal/logic/ai/aiconversationdeletelogic.go

@@ -5,9 +5,11 @@ package ai
 
 import (
 	"context"
+	"errors"
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +30,22 @@ func NewAiConversationDeleteLogic(ctx context.Context, svcCtx *svc.ServiceContex
 }
 
 func (l *AiConversationDeleteLogic) AiConversationDelete(req *types.AIConversationDeleteRequest) (resp *types.Response, err error) {
-	// todo: add your logic here and delete this line
+	userId, _ := l.ctx.Value("userId").(int64)
+	if userId == 0 {
+		return nil, errors.New("unauthorized")
+	}
+
+	conv, err := model.AIConversationFindOne(l.ctx, l.svcCtx.DB, req.Id)
+	if err != nil {
+		return nil, err
+	}
+	if conv.UserId != userId {
+		return nil, errors.New("forbidden")
+	}
+
+	if err := model.AIConversationDelete(l.ctx, l.svcCtx.DB, req.Id); err != nil {
+		return nil, err
+	}
 
-	return
+	return &types.Response{Success: true}, nil
 }

backend/internal/logic/ai/aiconversationgetlogic.go

@@ -5,9 +5,11 @@ package ai
 
 import (
 	"context"
+	"errors"
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +30,52 @@ func NewAiConversationGetLogic(ctx context.Context, svcCtx *svc.ServiceContext)
 }
 
 func (l *AiConversationGetLogic) AiConversationGet(req *types.AIConversationGetRequest) (resp *types.AIConversationDetailResponse, err error) {
-	// todo: add your logic here and delete this line
+	userId, _ := l.ctx.Value("userId").(int64)
+	if userId == 0 {
+		return nil, errors.New("unauthorized")
+	}
+
+	conv, err := model.AIConversationFindOne(l.ctx, l.svcCtx.DB, req.Id)
+	if err != nil {
+		return nil, err
+	}
+	if conv.UserId != userId {
+		return nil, errors.New("forbidden")
+	}
+
+	// Get messages
+	messages, err := model.AIChatMessageFindByConversation(l.ctx, l.svcCtx.DB, conv.Id)
+	if err != nil {
+		return nil, err
+	}
+
+	msgList := make([]types.AIMessageInfo, len(messages))
+	for i, m := range messages {
+		msgList[i] = types.AIMessageInfo{
+			Id:             m.Id,
+			ConversationId: m.ConversationId,
+			Role:           m.Role,
+			Content:        m.Content,
+			TokenCount:     m.TokenCount,
+			Cost:           m.Cost,
+			ModelId:        m.ModelId,
+			LatencyMs:      m.LatencyMs,
+			CreatedAt:      m.CreatedAt.Format("2006-01-02 15:04:05"),
+		}
+	}
 
-	return
+	return &types.AIConversationDetailResponse{
+		Conversation: types.AIConversationInfo{
+			Id:          conv.Id,
+			Title:       conv.Title,
+			ModelId:     conv.ModelId,
+			ProviderId:  conv.ProviderId,
+			TotalTokens: conv.TotalTokens,
+			TotalCost:   conv.TotalCost,
+			IsArchived:  conv.IsArchived,
+			CreatedAt:   conv.CreatedAt.Format("2006-01-02 15:04:05"),
+			UpdatedAt:   conv.UpdatedAt.Format("2006-01-02 15:04:05"),
+		},
+		Messages: msgList,
+	}, nil
 }

backend/internal/logic/ai/aiconversationlistlogic.go

@@ -5,9 +5,11 @@ package ai
 
 import (
 	"context"
+	"errors"
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +30,30 @@ func NewAiConversationListLogic(ctx context.Context, svcCtx *svc.ServiceContext)
 }
 
 func (l *AiConversationListLogic) AiConversationList(req *types.AIConversationListRequest) (resp *types.AIConversationListResponse, err error) {
-	// todo: add your logic here and delete this line
+	userId, _ := l.ctx.Value("userId").(int64)
+	if userId == 0 {
+		return nil, errors.New("unauthorized")
+	}
+
+	conversations, total, err := model.AIConversationFindByUser(l.ctx, l.svcCtx.DB, userId, req.Page, req.PageSize)
+	if err != nil {
+		return nil, err
+	}
+
+	list := make([]types.AIConversationInfo, len(conversations))
+	for i, c := range conversations {
+		list[i] = types.AIConversationInfo{
+			Id:          c.Id,
+			Title:       c.Title,
+			ModelId:     c.ModelId,
+			ProviderId:  c.ProviderId,
+			TotalTokens: c.TotalTokens,
+			TotalCost:   c.TotalCost,
+			IsArchived:  c.IsArchived,
+			CreatedAt:   c.CreatedAt.Format("2006-01-02 15:04:05"),
+			UpdatedAt:   c.UpdatedAt.Format("2006-01-02 15:04:05"),
+		}
+	}
 
-	return
+	return &types.AIConversationListResponse{List: list, Total: total}, nil
 }

backend/internal/logic/ai/aiconversationupdatelogic.go

@@ -5,9 +5,11 @@ package ai
 
 import (
 	"context"
+	"errors"
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +30,33 @@ func NewAiConversationUpdateLogic(ctx context.Context, svcCtx *svc.ServiceContex
 }
 
 func (l *AiConversationUpdateLogic) AiConversationUpdate(req *types.AIConversationUpdateRequest) (resp *types.AIConversationInfo, err error) {
-	// todo: add your logic here and delete this line
+	userId, _ := l.ctx.Value("userId").(int64)
+	if userId == 0 {
+		return nil, errors.New("unauthorized")
+	}
+
+	conv, err := model.AIConversationFindOne(l.ctx, l.svcCtx.DB, req.Id)
+	if err != nil {
+		return nil, err
+	}
+	if conv.UserId != userId {
+		return nil, errors.New("forbidden")
+	}
+
+	conv.Title = req.Title
+	if err := model.AIConversationUpdate(l.ctx, l.svcCtx.DB, conv); err != nil {
+		return nil, err
+	}
 
-	return
+	return &types.AIConversationInfo{
+		Id:          conv.Id,
+		Title:       conv.Title,
+		ModelId:     conv.ModelId,
+		ProviderId:  conv.ProviderId,
+		TotalTokens: conv.TotalTokens,
+		TotalCost:   conv.TotalCost,
+		IsArchived:  conv.IsArchived,
+		CreatedAt:   conv.CreatedAt.Format("2006-01-02 15:04:05"),
+		UpdatedAt:   conv.UpdatedAt.Format("2006-01-02 15:04:05"),
+	}, nil
 }

backend/internal/logic/ai/aimodellistlogic.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +29,34 @@ func NewAiModelListLogic(ctx context.Context, svcCtx *svc.ServiceContext) *AiMod
 }
 
 func (l *AiModelListLogic) AiModelList() (resp *types.AIModelListResponse, err error) {
-	// todo: add your logic here and delete this line
+	models, err := model.AIModelFindAllActive(l.ctx, l.svcCtx.DB)
+	if err != nil {
+		return nil, err
+	}
+
+	// Build provider name map
+	providerNames := make(map[int64]string)
+	providers, _ := model.AIProviderFindAllActive(l.ctx, l.svcCtx.DB)
+	for _, p := range providers {
+		providerNames[p.Id] = p.DisplayName
+	}
+
+	list := make([]types.AIModelInfo, len(models))
+	for i, m := range models {
+		list[i] = types.AIModelInfo{
+			Id:             m.Id,
+			ProviderId:     m.ProviderId,
+			ProviderName:   providerNames[m.ProviderId],
+			ModelId:        m.ModelId,
+			DisplayName:    m.DisplayName,
+			InputPrice:     m.InputPrice,
+			OutputPrice:    m.OutputPrice,
+			MaxTokens:      m.MaxTokens,
+			ContextWindow:  m.ContextWindow,
+			SupportsStream: m.SupportsStream,
+			SupportsVision: m.SupportsVision,
+		}
+	}
 
-	return
+	return &types.AIModelListResponse{List: list}, nil
 }

backend/internal/logic/ai/aiquotamelogic.go

@@ -5,9 +5,11 @@ package ai
 
 import (
 	"context"
+	"errors"
 
 	"github.com/youruser/base/internal/svc"
 	"github.com/youruser/base/internal/types"
+	"github.com/youruser/base/model"
 
 	"github.com/zeromicro/go-zero/core/logx"
 )
@@ -28,7 +30,20 @@ func NewAiQuotaMeLogic(ctx context.Context, svcCtx *svc.ServiceContext) *AiQuota
 }
 
 func (l *AiQuotaMeLogic) AiQuotaMe() (resp *types.AIQuotaInfo, err error) {
-	// todo: add your logic here and delete this line
+	userId, _ := l.ctx.Value("userId").(int64)
+	if userId == 0 {
+		return nil, errors.New("unauthorized")
+	}
+
+	quota, err := model.AIUserQuotaEnsure(l.ctx, l.svcCtx.DB, userId)
+	if err != nil {
+		return nil, err
+	}
 
-	return
+	return &types.AIQuotaInfo{
+		Balance:        quota.Balance,
+		TotalRecharged: quota.TotalRecharged,
+		TotalConsumed:  quota.TotalConsumed,
+		FrozenAmount:   quota.FrozenAmount,
+	}, nil
 }