chore: Update paths in test and database configuration

This commit updates the paths in the test suite and database configuration to reflect the new directory structure. In the `api/cmd/main_test.go` file, the path for the config file is changed from `viper.SetConfigName(".env")` to `viper.SetConfigFile("../.env")` and `viper.AddConfigPath(".")` is added for configuration purposes. Additionally, `viper.AutomaticEnv()` is added to enable automatic environment variable configuration. In the same file, error handling is improved by adding explicit checks and error messages. The `api/internal/database/database.go` file is also modified, updating the path for database initialization from `"../db/water.sqlite3"` to `"../../db/water.sqlite3"`. These changes ensure proper configuration and functioning of the application.

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