feat: implement text-to-speech service, add API routers, and define database models

revert: rollback project files to stable chat backend (commit f1332f7)

feat: implement YouTube note generation pipeline with task tracking and automated summarization.

feat: change the implemention pipeline to Supadata-first

feat: define User, Category, and Note database models using Pydantic

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fix log v1.5.4

fix log v1.5.3

enhance log

v2.1

server v2

v1.5