Fix 20 incorrect character mappings in 常用字字形表.txt

[Copilot]

Corrects character mapping errors in 常用字字形表.txt identified via cross-reference with NightFurySL2001/cjktables@047d0de.

Changes

6 specific index corrections:

• 0187: 倶 (U+5036) → 俱 (U+4FF1)
• 0336: 别 (U+522B) → 別 (U+5225)
• 0523: 呐 (U+5450) → 吶 (U+5436)
• 1230: 弑 (U+5F11) → 弒 (U+5F12)
• 1874: 枏 (U+678F) → 枚 (U+679A)
• 3657: 蠏 (U+880F) → 蟹 (U+87F9)

14 additional character replacements:

• 僣→僭, 卬→卯, 嗉→嗦, 琨→琵, 瘐→瘦, 禺→禹, 穇→穆, 粺→粹, 縕→縊, 薜→薛, 薶→藐, 褟→褶, 訏→訐, 陜→陝

All incorrect characters removed; Unicode code points verified against specification.

Original prompt

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This section details on the original issue you should resolve

<issue_title>常用字字形表.txt 部分错误</issue_title>
<issue_description>可参见 NightFurySL2001/cjktables@047d0de 和 NightFurySL2001/CJK-character-count#28

僣卬嗉枏琨瘐禺穇粺縕薜薶褟訏陜：15字都不存在
僭卯嗦枴琵瘦禹穆粹縊薛藐褶訐陝：15字都存在

0187 倶 5036 俱 4FF1 错误
0336 别 522B 別 5225 错误
0523 呐 5450 吶 5436 错误
1230 弑 5F11 弒 5F12 错误
1874 枏 678F 枚 679A 错误
3657 蠏 880F 蟹 87F9 错误
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 常用字字形表.txt 部分错误 #7

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