Translate the first half of howto/descriptor

[Copilot]

This PR completes the translation of the first half of the Python descriptor guide (howto/descriptor.po) from English to Traditional Chinese (Taiwan).

What was translated

The first half includes:

1. Introduction & Contents Section

• Guide overview explaining the four major sections
• Clear navigation guidance for readers new to descriptors

2. Primer Section (Complete)

• Simple example: Basic descriptor that returns a constant
• Dynamic lookups: Descriptors that run computations
• Managed attributes: Using descriptors to control access to instance data
• Customized names: Leveraging __set_name__ for automatic field naming
• Closing thoughts: Core descriptor concepts and their usage throughout Python

Translation Quality

• ✅ Build tested: No syntax errors or warnings
• ✅ Terminology consistency: Established standard Chinese translations for key technical terms
• ✅ reST formatting preserved: All Sphinx markup and cross-references maintained
• ✅ Code examples preserved: Programming examples left in English as per project conventions

Key Technical Terms Established

English	繁體中文
descriptor	描述器
attribute lookup	屬性查找
class variable	類別變數
instance	實例
dynamic lookup	動態查找
managed attributes	受管理的屬性
dot operator	點運算子
callback	回呼

The translation makes descriptor concepts accessible to Chinese-speaking Python developers, covering all fundamental examples and explanations needed to understand how descriptors work.

Fixes #450.

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