deps: update dependencies for GORM, Viper, and SQLite support

- Add GORM v1.25.12 with MySQL and SQLite drivers
- Add Viper v1.19.0 for configuration management
- Add UUID package for GORM model IDs
- Update vendor directory with new dependencies
- Update Go module requirements and checksums

🤖 Generated with [Claude Code](https://claude.ai/code)

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

vendor/github.com/sourcegraph/conc/internal/multierror/multierror_go119.go

@@ -0,0 +1,10 @@
+//go:build !go1.20
+// +build !go1.20
+
+package multierror
+
+import "go.uber.org/multierr"
+
+var (
+	Join = multierr.Combine
+)

vendor/github.com/sourcegraph/conc/internal/multierror/multierror_go120.go

@@ -0,0 +1,10 @@
+//go:build go1.20
+// +build go1.20
+
+package multierror
+
+import "errors"
+
+var (
+	Join = errors.Join
+)