fix(ai): 收紧AI任务类型入库规则

apps/web/lib/task-category.ts

@@ -123,6 +123,15 @@ export function findCategoryByCode(categories: TaskCategory[], code?: string): T
   return categories.find((c) => c.code === code);
 }
 
+function findCategoryByCodeInGroup(
+  categories: TaskCategory[],
+  code: string | undefined,
+  group: CategoryGroup,
+): TaskCategory | undefined {
+  if (!code) return undefined;
+  return categories.find((category) => category.group === group && category.code === code);
+}
+
 export function getDefaultCategoryByGroup(categories: TaskCategory[], group: CategoryGroup): TaskCategory {
   return getCategoriesByGroup(categories, group)[0] ?? categories[0] ?? PRESET_CATEGORIES[0];
 }
@@ -135,13 +144,24 @@ export function ensureTaskCategoryByName(
   categories: TaskCategory[],
   name: string | undefined,
   group: CategoryGroup,
+): { categories: TaskCategory[]; category: TaskCategory; created: boolean } {
+  return resolveAiTaskCategoryByName(categories, name, group, { allowCreate: true });
+}
+
+export function resolveAiTaskCategoryByName(
+  categories: TaskCategory[],
+  name: string | undefined,
+  group: CategoryGroup,
+  options: { allowCreate?: boolean; fallbackCode?: string } = {},
 ): { categories: TaskCategory[]; category: TaskCategory; created: boolean } {
   const normalizedCategories = normalizeTaskCategories(categories);
   const trimmedName = name?.trim() ?? '';
   if (!trimmedName) {
     return {
       categories: normalizedCategories,
-      category: getDefaultCategoryByGroup(normalizedCategories, group),
+      category:
+        findCategoryByCodeInGroup(normalizedCategories, options.fallbackCode, group) ??
+        getDefaultCategoryByGroup(normalizedCategories, group),
       created: false,
     };
   }
@@ -153,6 +173,15 @@ export function ensureTaskCategoryByName(
   if (existing) {
     return { categories: normalizedCategories, category: existing, created: false };
   }
+  if (options.allowCreate === false) {
+    return {
+      categories: normalizedCategories,
+      category:
+        findCategoryByCodeInGroup(normalizedCategories, options.fallbackCode, group) ??
+        getDefaultCategoryByGroup(normalizedCategories, group),
+      created: false,
+    };
+  }
 
   const codeBase = slugifyCategoryName(trimmedName, normalizedCategories.length);
   const category: TaskCategory = {