feat(project): add the user_prompt field

[Moskize91]

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[Copilot]

Pull Request Overview

This PR introduces a user_prompt parameter across the translation pipeline to allow custom rules to be injected, updates the translation template to respect those prompts, and adjusts example scripts to demonstrate its use.

• Adds user_prompt argument through translate, _Translator, and helper functions.
• Implements normalization and embedding of user rules via <rules> tags.
• Updates Jinja template and example scripts to accept and pass user_prompt.

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
scripts/translate_texts.py	Passes new user_prompt and max_threads_count
scripts/translate_epub.py	Uses test asset paths and injects user_prompt
epub_translator/translator.py	Adds user_prompt parameter and stores it
epub_translator/translation/utils.py	Introduces is_empty helper and regex constant
epub_translator/translation/translation.py	Propagates user_prompt, normalizes input, and embeds rules
epub_translator/data/translate.jinja	Enhances template to conditionally include user rules

Comments suppressed due to low confidence (5)

epub_translator/translation/utils.py:7

• [nitpick] Consider adding a docstring for is_empty to explain its purpose and the pattern it detects, improving maintainability.

def is_empty(text: str) -> bool:

epub_translator/translation/translation.py:176

• [nitpick] A docstring describing how _normalize_user_input handles blank lines and merging rules would clarify its behavior for future readers.

def _normalize_user_input(user_lines: list[str]) -> str | None:

epub_translator/translation/translation.py:23

• New user_prompt handling logic (normalization, embedding <rules>, template branching) needs unit tests to ensure correct integration and formatting.

      user_prompt: str | None,

epub_translator/data/translate.jinja:1

• It looks like literal line-number prefixes (e.g. 1 ) were accidentally included in the template. Remove those numeric prefixes so they aren't rendered in the translation prompt.

你是一位翻译家，用户接下来的发言会提交一段{% if user_prompt %}翻译要求和一段{% endif %}文本的原文。你要将原文翻译成{{ target_language }}。

scripts/translate_texts.py:25

• [nitpick] Hardcoding max_threads_count=1 in the script may limit performance. Consider exposing this as a configurable parameter or using the default from the library.

    max_threads_count=1,