IAV-1324/feat(memory): add conversation facts extraction endpoint for Phase 3
- Add POST /api/izemx-prompt-processing/generate-conversation-facts with ConversationFactsRequestDTO and ConversationFactsResponseDTO.
- Extend PromptProcessingService/Impl with generateConversationFacts(previousFacts, exchangeToMerge, userId) using a strict verifiable-facts prompt (temperature 0.2).
- Add Paths.IzemxPromptProcessing.GENERATE_CONVERSATION_FACTS.
- Add LiteLlmProperties.extractionModel with fallback to chatModel.