Add Chinese descriptions and examples to config files

- Add description_zh field with Traditional Chinese descriptions to all 14 config files
- Add examples field with typical conversion examples for each config
- Add config-examples.test.js to validate conversion examples
- Examples demonstrate differences between variants (e.g., s2tw vs s2twp)

Key updates:
- s2t, t2s, hk2t, t2hk, t2tw, tw2t: Use 'OpenCC標準繁體' to clarify this is an intermediate standard format
- jp2t, t2jp: Keep '繁體（舊字體）' as it refers to Japanese Kyūjitai
- package.json: Update test script to run config-examples.test.js
- dist/data/config/: Generated from data/config/ via build process

Helper scripts:
- test/check-conversions.js: Verify conversion examples
- scripts/find-variant-examples.js: Find variant examples

All 94 tests passing.

Author: claude

wasm-lib/data/config/hk2s.json

@@ -1,5 +1,11 @@
 {
   "name": "Traditional Chinese (Hong Kong variant) to Simplified Chinese",
+  "description_zh": "香港繁體到簡體",
+  "examples": [
+    {"input": "軟件", "output": "软件"},
+    {"input": "資訊", "output": "资讯"},
+    {"input": "裏", "output": "里"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {
@@ -16,7 +22,7 @@
       }, {
         "type": "ocd2",
         "file": "HKVariantsRev.ocd2"
-      }] 
+      }]
     }
   }, {
     "dict": {

wasm-lib/data/config/hk2t.json

@@ -1,5 +1,10 @@
 {
-  "name": "Traditional Chinese (Hong Kong variant) to Traditional Chinese",
+  "name": "Traditional Chinese (Hong Kong variant) to Traditional Chinese (OpenCC Standard)",
+  "description_zh": "香港繁體到OpenCC標準繁體",
+  "examples": [
+    {"input": "台", "output": "臺"},
+    {"input": "説", "output": "說"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {
@@ -16,7 +21,7 @@
       }, {
         "type": "ocd2",
         "file": "HKVariantsRev.ocd2"
-      }] 
+      }]
     }
   }]
 }

wasm-lib/data/config/jp2t.json

@@ -1,5 +1,11 @@
 {
   "name": "New Japanese Kanji (Shinjitai) to Traditional Chinese Characters (Kyūjitai)",
+  "description_zh": "日文新字體到繁體（舊字體）",
+  "examples": [
+    {"input": "国", "output": "國"},
+    {"input": "学", "output": "學"},
+    {"input": "会", "output": "會"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/s2hk.json

@@ -1,5 +1,12 @@
 {
   "name": "Simplified Chinese to Traditional Chinese (Hong Kong variant)",
+  "description_zh": "簡體到香港繁體",
+  "examples": [
+    {"input": "鼠标", "output": "鼠標"},
+    {"input": "软件", "output": "軟件"},
+    {"input": "计算机", "output": "計算機"},
+    {"input": "里", "output": "裏"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/s2t.json

@@ -1,5 +1,11 @@
 {
-  "name": "Simplified Chinese to Traditional Chinese",
+  "name": "Simplified Chinese to Traditional Chinese (OpenCC Standard)",
+  "description_zh": "簡體到OpenCC標準繁體",
+  "examples": [
+    {"input": "鼠标", "output": "鼠標"},
+    {"input": "计算机", "output": "計算機"},
+    {"input": "软件", "output": "軟件"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/s2tw.json

@@ -1,5 +1,11 @@
 {
   "name": "Simplified Chinese to Traditional Chinese (Taiwan standard)",
+  "description_zh": "簡體到台灣正體",
+  "examples": [
+    {"input": "鼠标", "output": "鼠標"},
+    {"input": "计算机", "output": "計算機"},
+    {"input": "软件", "output": "軟件"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/s2twp.json

@@ -1,5 +1,12 @@
 {
   "name": "Simplified Chinese to Traditional Chinese (Taiwan standard, with phrases)",
+  "description_zh": "簡體到台灣正體（包含慣用詞轉換）",
+  "examples": [
+    {"input": "数据库", "output": "資料庫"},
+    {"input": "软件", "output": "軟體"},
+    {"input": "鼠标", "output": "滑鼠"},
+    {"input": "网络", "output": "網路"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/t2hk.json

@@ -1,5 +1,10 @@
 {
-  "name": "Traditional Chinese to Traditional Chinese (Hong Kong variant)",
+  "name": "Traditional Chinese (OpenCC Standard) to Traditional Chinese (Hong Kong variant)",
+  "description_zh": "OpenCC標準繁體到香港繁體",
+  "examples": [
+    {"input": "臺", "output": "台"},
+    {"input": "說", "output": "説"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/t2jp.json

@@ -1,5 +1,11 @@
 {
   "name": "Traditional Chinese Characters (Kyūjitai) to New Japanese Kanji (Shinjitai)",
+  "description_zh": "繁體（舊字體）到日文新字體",
+  "examples": [
+    {"input": "國", "output": "国"},
+    {"input": "學", "output": "学"},
+    {"input": "會", "output": "会"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {

wasm-lib/data/config/t2s.json

@@ -1,5 +1,11 @@
 {
-  "name": "Traditional Chinese to Simplified Chinese",
+  "name": "Traditional Chinese (OpenCC Standard) to Simplified Chinese",
+  "description_zh": "OpenCC標準繁體到簡體",
+  "examples": [
+    {"input": "鼠標", "output": "鼠标"},
+    {"input": "計算機", "output": "计算机"},
+    {"input": "軟件", "output": "软件"}
+  ],
   "segmentation": {
     "type": "mmseg",
     "dict": {