feat: implement dynamic model-specific samples and resolve session stability error

fix: restored tab_report signature and corrected indentation

fix: resolved IndentationError in tab_report

feat: added more image samples and civil assessment demo mode

deploy: migrated demo assets to cloud folder and updated path logic

fix: Switched to gemini-flash-latest to resolve persistent 404 error

fix: Reverted to Gemini 1.5 Flash to resolve quota limits

fix: Switched to Gemini 2.0 Flash to resolve model 404 error

fix: Explicitly set Gemini API version to v1 to resolve 404 error

fix: Optimized RAG imports for latest LangChain version

fix: Corrected internal package imports after professional restructuring

refactor: Implemented professional modular structure (apds package)