Multi Search Engine

更新日志v2.1.3

**Summary:** This version updates cookie handling and search execution policies for increased privacy and more ethical crawling. - Switched to initializing an empty in-memory cookie store; no cookies are pre-loaded from files. - Cookies are acquired dynamically only when a search request is denied and cleared immediately after the session. - Only relevant search engines are queried, based on language and engine availability, rather than always searching all engines in a category. - Introduced stricter rate limiting (1-2 second delays, batch sizes of 3-4) to control request flow. - Strengthened privacy statements: cookies are held strictly in memory and never written to disk or config files. - Improved documentation of search logic, cookie management, and crawling ethics.

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