feat: 新增控笔练习，增加首页公告

miniprogram/config/worksheets/index.ts

@@ -0,0 +1,7 @@
+export type { WorksheetDefinition } from './types';
+export { MATH_WORKSHEET_DEFINITIONS } from './math';
+export { FOCUS_WORKSHEET_DEFINITIONS } from './focus';
+export { LETTER_TRACING_WORKSHEET_DEFINITIONS } from './letterTracing';
+export { PINYIN_DICTATION_WORKSHEET_DEFINITIONS } from './pinyin';
+export { PEN_CONTROL_WORKSHEET_DEFINITIONS } from './penControl';
+export { WORD_COLORING_WORKSHEET_DEFINITIONS } from './wordColoring';