feat(*): 创作工作台 - 完善媒体上传预览与连线交互并修复任务章节及日志筛选

web/src/lib/canvas/canvas-character-reference.ts

@@ -132,7 +132,7 @@ function flattenCharacterCandidates(value: unknown): unknown[] | undefined {
     return undefined;
 }
 
-function extractCharacterBreakdownJson(raw: string) {
+export function extractCharacterBreakdownJson(raw: string, allowEmptyCharacters = false) {
     for (let start = 0; start < raw.length; start += 1) {
         if (raw[start] !== "{" && raw[start] !== "[") continue;
         const end = findJsonValueEnd(raw, start);
@@ -144,6 +144,9 @@ function extractCharacterBreakdownJson(raw: string) {
             // 模型的推理文字可能包含 aliases: [] 等合法 JSON 片段；角色契约只接受带 characters 字段的对象。
             const candidates = parsed && typeof parsed === "object" && !Array.isArray(parsed) ? flattenCharacterCandidates((parsed as { characters?: unknown }).characters) : undefined;
             if (Array.isArray(candidates) && candidates.length) return parsed;
+            // 章节资产允许无人场景；仍交由章节解析器校验三个必填数组。
+            if (allowEmptyCharacters && parsed && typeof parsed === "object" && !Array.isArray(parsed)
+                && Array.isArray((parsed as { characters?: unknown }).characters)) return parsed;
         } catch {
             // Ignore unrelated braces in model prose and continue to the next complete JSON value.
         }