feat(*): 云端 Agent - 增强画布上下文读取并接入 Gemini 缓存

backend/internal/database/schema.go

@@ -21,6 +21,7 @@ func Models() []any {
 		&model.CloudAgentMessageRecord{},
 		&model.CloudAgentCanvasMutation{},
 		&model.CloudAgentResourceLease{},
+		&model.CloudAgentGeminiCache{},
 		&model.AgentProfile{},
 		&model.AgentLesson{},
 		&model.AgentMemorySetting{},