zenfun eaf99e1582 feat(config): migrate configuration management to viper ...

Replace manual environment variable parsing with Viper to support
file-based configuration.

- Enable loading config from `config.yaml` or `./config/config.yaml`
- Allow custom config path via `EZ_CONFIG_FILE` environment variable
- Bind existing environment variables to maintain backward compatibility
- Update documentation with configuration examples and precedence rules

2025-12-12 22:50:54 +08:00

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