refactor(*): 代码质量 - 优化前后端实现并完善协议与画布验证

backend/internal/generation/deps.go

@@ -3,7 +3,7 @@ package generation
 import (
 	"context"
 
-	"infinite-canvas/backend/internal/protocol"
+	"yingce/backend/internal/protocol"
 )
 
 // MediaResolver 水合参考媒体（资源 URL / data URL），由组合根注入，避免 generation → service 回环。

backend/internal/generation/engine.go

@@ -1,7 +1,7 @@
 package generation
 
 import (
-	"infinite-canvas/backend/internal/protocol"
+	"yingce/backend/internal/protocol"
 )
 
 // Engine 是 generation 域的入口；由 service 组合根构造并注入 Deps。

backend/internal/generation/engine_test.go

@@ -3,7 +3,7 @@ package generation_test
 import (
 	"testing"
 
-	"infinite-canvas/backend/internal/generation"
+	"yingce/backend/internal/generation"
 )
 
 func TestGenerationPackageHasEngineAndOfficialRegistry(t *testing.T) {

backend/internal/generation/registry.go

@@ -8,8 +8,8 @@ import (
 	"strings"
 	"sync"
 
-	"infinite-canvas/backend/internal/model"
-	"infinite-canvas/backend/internal/protocol"
+	"yingce/backend/internal/model"
+	"yingce/backend/internal/protocol"
 )
 
 type protocolRegistryContextKey struct{}

backend/internal/generation/types.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"time"
 
-	"infinite-canvas/backend/internal/outbound"
+	"yingce/backend/internal/outbound"
 )
 
 // Input 是画布生成任务的统一输入合同。