RetrieX Shop Query Language Fix

Patch-only fix for v1.5.0.

Problem

The Shopware query optimizer could translate German user input into English, for example:

welchen testomat kann ich nutzen zur freien chlor messung

became:

testomat free chlorine measurement

This reduced Shopware hit quality because the shop catalog is primarily queried with German/domain terms.

Strengthens config/retriex/agent.yaml prompt rules so the optimized shop query must preserve the language of the current user input.
Adds configurable language-preservation settings under shop_prompt.language_preservation.
Adds a small post-optimizer repair step in AgentRunner that only applies configured replacements when the current user input matches configured language markers.
Keeps all translation/repair terms in YAML/fallback config, not as hard-coded product-specific logic in the Shop/Retrieval core.
Extends the effective config dump with the new language-preservation settings.

testomat free chlorine measurement

is repaired to:

testomat freies chlor messung

for German input.

No Retrieval, Vector, Scoring, PromptBuilder, SearchRepair or Shopware API logic changed.
No Testomat-808-specific logic.
Product names, brands and model numbers remain preserved.
All new language repair rules are configurable in agent.yaml.

php bin/console cache:clear
php bin/console mto:agent:config:validate
php bin/console mto:agent:regression:test

Then retest:

welchen testomat kann ich nutzen zur freien chlor messung

The displayed shop query should stay German, e.g.:

testomat freies chlor messung