Refactor RCA result retrieval and schema: update endpoint to return multiple results and modify schema fields for consistency

cors

Refactor database connection: move connection logic to db.py and update imports in app.py and schema.py

app

Refactor RCA service: add schema for RCA results, implement async database connection, and integrate AI reasoning model

Implement AI reasoning for RCA results; add prompt generation and model inference

Add .gitignore, implement async database connection, and update app logic

Create app.py