feat(signals): 多语言信号提取 + 需求/改进标签携带描述信息

[shinjiyu]

Summary

• 多语言信号识别：user_feature_request 和 user_improvement_suggestion 支持简体中文、繁体中文、英语、日语四种语言的 pattern 匹配。
• 标签携带描述：信号以 baseName:snippet 格式输出（如 user_feature_request:帮我开发一个跳一跳的微信小程序），snippet 最长 200 字，供 selector 和 GEP prompt 使用，提升上下文精准度。
• 协议兼容：mutation.js、questionGenerator.js 同步更新，兼容带 snippet 的信号格式；selector.js 本身已通过子串匹配天然支持，无需改动。

Changed Files

文件	说明
src/gep/signals.js	四语言 pattern + baseName:snippet 提取逻辑
src/gep/mutation.js	hasOpportunitySignal 兼容 name:snippet 格式
src/gep/questionGenerator.js	user_feature_request 检测兼容带前缀格式
test/signals.test.js	新增（23 个测试：四语言基础用例 + 13 条边界条件）
test/selector.test.js	补充 baseName:snippet 格式的基因匹配用例

Test Plan

• node test/signals.test.js — 23 个测试全部通过（覆盖超长截断、「我想…」、空输入、仅标点、换行、多信号共存等边界条件）
• node test/selector.test.js — 10 个测试全部通过（含 snippet 格式匹配用例）
• node test/mutation.test.js — 19 个测试全部通过

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Note

Medium Risk
Touches core signal extraction and categorization logic, which can change gene/candidate selection behavior and innovation vs repair routing. Changes are regex-heavy but are covered by new unit tests for multilingual and :snippet formats.

Overview
Updates extractSignals to detect feature requests and improvement suggestions across English, Simplified/Traditional Chinese, and Japanese, and to emit them as name:snippet (snippet clipped to 200 chars) for better downstream context.

Makes signal consumers tolerant of the new suffix format (opportunity detection in mutation.js/signals.js, capability candidate generation in candidates.js, and questionGenerator.js feature-request prompting), tweaks error/perf/capability regex coverage for Chinese, and adds focused tests for snippet-format gene matching plus a new signals.test.js covering multilingual and edge cases.

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[autogame-17]

Merged into the main codebase. The multilingual signal extraction (ZH-CN, ZH-TW, EN, JA), baseName:snippet format, and all related compatibility updates have been incorporated along with the full test suite. Thank you for the contribution!