fix: 办公四件套 description 添加中文触发词，修复中文消息无法触发技能的问题

skills/docx/SKILL.md

@@ -11,7 +11,8 @@ description: >-
   Word document. If the user asks for a "report", "memo", "letter", "template",
   or similar deliverable as a Word or .docx file, use this skill. Do NOT use for
   PDFs, spreadsheets, Google Docs, or general coding tasks unrelated to document
-  generation.
+  generation. Use when 用户提到 Word文档、docx、创建文档、编辑文档、报告、
+  备忘录、公文、合同、信函模板。
 version: 1.0.0
 type: procedural
 risk_level: low

skills/pdf/SKILL.md

@@ -6,7 +6,9 @@ description: >-
   multiple PDFs into one, splitting PDFs apart, rotating pages, adding
   watermarks, creating new PDFs, filling PDF forms, encrypting/decrypting PDFs,
   extracting images, and OCR on scanned PDFs to make them searchable. If the
-  user mentions a .pdf file or asks to produce one, use this skill.
+  user mentions a .pdf file or asks to produce one, use this skill. Use when
+  用户提到 PDF、读取PDF、合并PDF、拆分PDF、填写表单、加水印、提取文字、
+  扫描识别。
 version: 1.0.0
 type: procedural
 risk_level: low

skills/pptx/SKILL.md

@@ -10,7 +10,8 @@ description: >-
   Trigger whenever the user mentions "deck," "slides," "presentation," or
   references a .pptx filename, regardless of what they plan to do with the
   content afterward. If a .pptx file needs to be opened, created, or touched,
-  use this skill.
+  use this skill. Use when 用户提到 PPT、演示文稿、幻灯片、演讲稿、汇报材料、
+  pptx、创建演示、编辑幻灯片。
 version: 1.0.0
 type: procedural
 risk_level: low

skills/xlsx/SKILL.md

@@ -13,7 +13,8 @@ description: >-
   junk data) into proper spreadsheets. The deliverable must be a spreadsheet
   file. Do NOT trigger when the primary deliverable is a Word document, HTML
   report, standalone Python script, database pipeline, or Google Sheets API
-  integration, even if tabular data is involved.
+  integration, even if tabular data is involved. Use when 用户提到 Excel、
+  电子表格、xlsx、表格处理、公式计算、数据清洗、图表、CSV导入导出。
 version: 1.0.0
 type: procedural
 risk_level: low