feat(server): add brand kit management and project binding

Add a brand kit domain with memory and postgres stores, a BrandKitService
for CRUD and resolution, and REST endpoints to list, upsert, and delete
brand kits. Projects can bind a brand kit whose resolved context and
reference images feed into the agent's long-term memory and design prompts.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/svc/service_context.go

@@ -12,6 +12,7 @@ import (
 
 	"img_infinite_canvas/internal/application"
 	"img_infinite_canvas/internal/config"
+	"img_infinite_canvas/internal/domain/brandkit"
 	"img_infinite_canvas/internal/domain/design"
 	"img_infinite_canvas/internal/infrastructure/backgroundremoval"
 	cacheinfra "img_infinite_canvas/internal/infrastructure/cache"
@@ -31,14 +32,15 @@ import (
 )
 
 type ServiceContext struct {
-	Config        config.Config
-	DesignService *application.DesignService
-	AuthService   *authmodule.Service
-	ShareService  *sharingmodule.Service
-	RealtimeBus   realtimemodule.Bus
-	jobQueue      design.JobQueue
-	jobWorker     backgroundWorker
-	outboxWorker  backgroundWorker
+	Config          config.Config
+	DesignService   *application.DesignService
+	BrandKitService *application.BrandKitService
+	AuthService     *authmodule.Service
+	ShareService    *sharingmodule.Service
+	RealtimeBus     realtimemodule.Bus
+	jobQueue        design.JobQueue
+	jobWorker       backgroundWorker
+	outboxWorker    backgroundWorker
 }
 
 type backgroundWorker interface {
@@ -49,6 +51,7 @@ type backgroundWorker interface {
 
 func NewServiceContext(c config.Config) *ServiceContext {
 	repo := newProjectRepository(c)
+	brandKitService := newBrandKitService(c)
 	cacheStore := newCacheStore(c)
 	authService := newAuthService(c, cacheStore)
 	shareService := newShareService(c)
@@ -61,6 +64,7 @@ func NewServiceContext(c config.Config) *ServiceContext {
 	researcher := newResearcher(c)
 	textExtractor := newTextExtractor(c)
 	service := application.NewDesignService(repo, agentRunner, assets, researcher, textExtractor, creativeAgent)
+	service.SetBrandKitService(brandKitService)
 	service.SetBackgroundRemover(newBackgroundRemover(c))
 	service.SetObjectRecognizer(newObjectRecognizer(c))
 	if mockupAnalyzer, ok := creativeAgent.(design.MockupModelAnalyzer); ok {
@@ -75,14 +79,15 @@ func NewServiceContext(c config.Config) *ServiceContext {
 	}
 
 	return &ServiceContext{
-		Config:        c,
-		DesignService: service,
-		AuthService:   authService,
-		ShareService:  shareService,
-		RealtimeBus:   realtimeBus,
-		jobQueue:      queue,
-		jobWorker:     worker,
-		outboxWorker:  outboxWorker,
+		Config:          c,
+		DesignService:   service,
+		BrandKitService: brandKitService,
+		AuthService:     authService,
+		ShareService:    shareService,
+		RealtimeBus:     realtimeBus,
+		jobQueue:        queue,
+		jobWorker:       worker,
+		outboxWorker:    outboxWorker,
 	}
 }
 
@@ -159,6 +164,32 @@ func (s *ServiceContext) Close() {
 			logx.Errorf("close sharing service failed: %v", err)
 		}
 	}
+	if s.BrandKitService != nil {
+		if err := s.BrandKitService.Close(); err != nil {
+			logx.Errorf("close brand kit service failed: %v", err)
+		}
+	}
+}
+
+func newBrandKitService(c config.Config) *application.BrandKitService {
+	var store brandkit.Store
+	switch c.Storage.Driver {
+	case "", "memory":
+		store = memory.NewBrandKitStore()
+	case "postgres":
+		if strings.TrimSpace(c.Storage.DataSource) == "" {
+			logx.Must(application.ErrMissingDataSource)
+		}
+		postgresStore, err := postgres.NewBrandKitStore(context.Background(), c.Storage.DataSource)
+		if err != nil {
+			logx.Must(err)
+		}
+		store = postgresStore
+	default:
+		logx.Must(application.ErrUnsupportedStorage)
+		store = memory.NewBrandKitStore()
+	}
+	return application.NewBrandKitService(store)
 }
 
 func newShareService(c config.Config) *sharingmodule.Service {