fix(canvas): 生成任务 - 校验视频提示词长度并修复工作流产物ID与供应商错误识别

web/src/lib/model-selection.ts

@@ -101,6 +101,19 @@ export function modelCompatibilityError(config: AiConfig, model: string, require
     return input.imageCount > 0 || input.videoCount > 0 || input.audioCount > 0 ? "音频模型只接受文本或单个角色卡输入" : "";
 }
 
+export function modelPromptLengthError(config: AiConfig, model: string, capability: ModelCapability, prompt: string) {
+    const channel = resolveModelChannel(config, model);
+    const configuredProfile = channel.modelCosts?.find((item) => item.model === modelOptionName(model))?.capabilityConfig;
+    if (!configuredProfile) return "";
+    const profile = modelCapabilityConfigFor(config, model);
+    const maxChars = capability === "text" ? profile.text?.references.promptMaxChars : capability === "image" ? profile.image?.references.promptMaxChars : capability === "video" ? profile.video?.references.promptMaxChars : undefined;
+    if (!maxChars || maxChars <= 0) return "";
+    const actualChars = Array.from(prompt).length;
+    if (actualChars <= maxChars) return "";
+    const label = capability === "text" ? "文本" : capability === "image" ? "图片" : "视频";
+    return `当前${label}模型提示词最多 ${maxChars} 个字符，完整提示词为 ${actualChars} 个字符。系统不会自动截断，请精简当前输入、连线内容或技能上下文后重试`;
+}
+
 export function modelRequestOptions(config: AiConfig, capability: ModelCapability) {
     switch (capability) {
         case "image":