fix: Update startup message and AI persona name for consistency in TTS responses

fix: Update shipping information prompts for clarity and conciseness

fix: Update TTS voice name to 'Despina' and enhance prompt for natural speech; modify startup message and adjust demo launch settings

refactor: Comment out token counting API request and streamline logging in LLMFinanceAnalyzer; update shipping information prompts in systemprompt

Fix summary_order function and update chat history for promotion interactions

refactor: Improve clarity and structure of user interaction stages in order processing

refactor: Update escalation instruction in order processing to improve clarity

refactor: Update display format in tool call and result messages for consistency

feat: Enhance audio processing and transcription features

feat: Implement tools calling

Update backend/systemprompt.py

Update backend/systemprompt.py

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