ci: add Gitea Actions workflows and placeholder tests

cmd/api/main.go

@@ -71,6 +71,7 @@ func main() {
 	profileHandler := handler.NewProfileHandler(userRepo)
 	habitFreezeHandler := handler.NewHabitFreezeHandler(habitFreezeRepo, habitRepo)
 	savingsHandler := handler.NewSavingsHandler(savingsRepo)
+	interestHandler := handler.NewInterestHandler(db)
 
 	// Initialize middleware
 	authMiddleware := customMiddleware.NewAuthMiddleware(cfg.JWTSecret)
@@ -103,6 +104,9 @@ func main() {
 	r.Post("/auth/forgot-password", authHandler.ForgotPassword)
 	r.Post("/auth/reset-password", authHandler.ResetPassword)
 
+	// Internal routes (API key protected)
+	interestHandler.RegisterRoutes(r)
+
 	// Protected routes
 	r.Group(func(r chi.Router) {
 		r.Use(authMiddleware.Authenticate)