Add motivation quote feature to smoking tracking API

- Introduced a new database model `SmokeMotivationQuote` for storing motivational quotes.
- Added a new API endpoint `GET /api/v1/smoke/motivation` to retrieve motivation quotes for users.
- Updated the main.go file to include the new model in the auto-migration process.
- Enhanced smoke_routes.go to register the new motivation route with the smoke handler.

cmd/api/main.go

@@ -60,6 +60,7 @@ func main() {
 		&smokemodel.SmokeAIAdvice{},
 		&smokemodel.SmokeAIAdviceUnlock{},
 		&smokemodel.SmokeAINextSmoke{},
+		&smokemodel.SmokeMotivationQuote{},
 	); err != nil {
 		log.Fatalf("auto migrate failed: %v", err)
 	}