* feat: implement centralized configuration service using viper
This commit introduces a centralized configuration service in `pkg/config`
to reduce code duplication and provide a unified way to manage configuration
across the project.
Key changes:
- Refactored `pkg/config` to use `github.com/spf13/viper` as the backend.
- Implemented `core.Config` interface with support for layered resolution
(defaults, files, environment variables).
- Added `LoadFile` to support merging multiple configuration files, with
automatic type detection for YAML and .env files.
- Migrated `pkg/agentic`, `pkg/devops`, `pkg/build`, and `pkg/release`
to use the new centralized service.
- Added `mapstructure` tags to configuration structs to support viper unmarshaling.
- Added comprehensive tests for the new configuration service features.
This addresses the recommendations from the Architecture & Design Pattern Audit.
* feat: implement centralized configuration service and address security alerts
- Introduced centralized configuration service in `pkg/config` using `viper`.
- Migrated major packages (`agentic`, `devops`, `build`, `release`) to the new service.
- Resolved merge conflicts with `dev` branch.
- Addressed CodeQL security alert by making UniFi TLS verification configurable.
- Fixed `go.mod` to ensure it is tidy and consistent with direct dependencies.
- Updated UniFi CLI to support TLS verification configuration.
