Release 3.14.3

Release 3.14.3

* [Feature] Add task registry for safe Lua task reference validation
* [Feature] Add text quality analysis for PDF garbage filtering
* [Feature] Implement basic PDF text extraction with UTF-16 detection
* [Feature] Add extra tables API for clickhouse plugin
* [Feature] Add confighelp documentation for RBL module
* [Feature] WebUI: add backend API interaction error log
* [Fix] Neural: by default include symbols with no flags
* [Fix] Symcache: make FINE propagation deterministic
* [Fix] URL: Prevent false positives from numeric IP regeneration in mailto URLs
* [Fix] Settings: Allow spaces in selector regexps
* [Fix] Prevent use-after-free in Redis callbacks after session cleanup
* [Fix] Lua 5.4 compatibility in clickhouse and elastic plugins
* [Fix] Use exact map lookup for DKIM key_table instead of glob
* [Fix] Handle connection errors with io_uring backend in HTTP client
* [Minor] Update public suffix list