fix(ai): 模型解析 - 兼容多种 JSON 顶层形态

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

@@ -108,6 +108,30 @@ function findJsonValueEnd(source: string, start: number) {
     return -1;
 }
 
+// 角色卡数组的最小特征：至少有一个元素带 name 字段。用于把真正的角色数组和模型正文里的
+// 旁枝数组（角色名列表、aliases 片段等）区分开，避免提取阶段命中错误片段。
+function isCharacterCardArray(value: unknown): value is unknown[] {
+    if (!Array.isArray(value) || !value.length) return false;
+    return value.some((item) => Boolean(item) && typeof item === "object" && typeof (item as Record<string, unknown>).name === "string");
+}
+
+// 模型偶尔把角色数组再包一层，或把 characters 写成以角色名为键的对象，这里统一摊平成候选列表。
+function flattenCharacterCandidates(value: unknown): unknown[] | undefined {
+    if (Array.isArray(value)) {
+        const result: unknown[] = [];
+        value.forEach((item) => {
+            if (Array.isArray(item)) {
+                result.push(...(flattenCharacterCandidates(item) ?? []));
+                return;
+            }
+            result.push(item);
+        });
+        return result;
+    }
+    if (value && typeof value === "object") return Object.values(value as Record<string, unknown>);
+    return undefined;
+}
+
 function extractCharacterBreakdownJson(raw: string) {
     for (let start = 0; start < raw.length; start += 1) {
         if (raw[start] !== "{" && raw[start] !== "[") continue;
@@ -115,9 +139,11 @@ function extractCharacterBreakdownJson(raw: string) {
         if (end < start) continue;
         try {
             const parsed: unknown = JSON.parse(raw.slice(start, end + 1));
+            // 顶层角色数组是常见的契约偏离，先判数组再判对象，两者都视为合法载荷。
+            if (isCharacterCardArray(parsed)) return parsed;
             // 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) ? (parsed as { characters?: unknown }).characters : undefined;
-            if (Array.isArray(candidates)) return parsed;
+            const candidates = parsed && typeof parsed === "object" && !Array.isArray(parsed) ? flattenCharacterCandidates((parsed as { characters?: unknown }).characters) : undefined;
+            if (Array.isArray(candidates) && candidates.length) return parsed;
         } catch {
             // Ignore unrelated braces in model prose and continue to the next complete JSON value.
         }
@@ -128,7 +154,7 @@ function extractCharacterBreakdownJson(raw: string) {
 export function parseCharacterBreakdown(raw: string): CharacterBreakdown[] {
     const unfenced = raw.trim().replace(/^```(?:json)?\s*/i, "").replace(/\s*```$/i, "");
     const parsed = extractCharacterBreakdownJson(unfenced);
-    const candidates = Array.isArray(parsed) ? parsed : parsed && typeof parsed === "object" ? (parsed as { characters?: unknown }).characters : undefined;
+    const candidates = Array.isArray(parsed) ? flattenCharacterCandidates(parsed) : flattenCharacterCandidates((parsed as { characters?: unknown }).characters);
     if (!Array.isArray(candidates)) throw new Error("角色拆解结果缺少 characters 数组");
 
     const seen = new Set<string>();