Add Go project scaffold (task 352)

- go.mod with module codeberg.org/snonux/geheim (go 1.22, mage dep)
- Magefile.go with Build, Test, Install, Uninstall targets
- cmd/geheim/main.go delegating to internal/cli
- Stub packages: cli, version, config, crypto, git, store, clipboard, shell
- go.sum generated; binary confirmed to build via mage build

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
new file mode 100644
index 0000000..3474b73
--- /dev/null
+++ b/internal/config/config.go
@@ -0,0 +1,5 @@
+// Package config handles loading and storing geheim configuration.
+package config
+
+// Config holds application-wide configuration values.
+type Config struct{}