Restructure project: Move root package to internal/sncli

Moved all 26 Go files from root directory to internal/sncli/ to:
- Reduce root directory clutter
- Follow modern Go project layout conventions
- Signal package is not for external consumption
- Improve project organization

Changes:
- Created internal/sncli/ directory structure
- Moved all *.go files from root to internal/sncli/ (preserving git history)
- Updated all import paths in cmd/sncli/ from:
  github.com/jonhadfield/sn-cli
  to:
  github.com/jonhadfield/sn-cli/internal/sncli

Verification:
✅ Build succeeds (make build)
✅ Tests pass (make test - 19.1% coverage)
✅ Linting passes (make lint - 0 issues)
✅ Binary functions correctly (--version, --help)
✅ Git history preserved with git mv

Root directory now contains only organizational files (go.mod, README,
CHANGELOG, Makefile, etc.) making the project structure cleaner and
more maintainable.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jonhadfield

cmd/sncli/backup.go

@@ -8,7 +8,7 @@ import (
 	"github.com/gookit/color"
 	"github.com/jonhadfield/gosn-v2/cache"
 	"github.com/jonhadfield/gosn-v2/common"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/pterm/pterm"
 	"github.com/urfave/cli/v2"
 	"golang.org/x/term"

cmd/sncli/debug.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 
 	"github.com/jonhadfield/gosn-v2/cache"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 )
 

cmd/sncli/export_enhanced.go

@@ -5,7 +5,7 @@ import (
 
 	"github.com/jonhadfield/gosn-v2/cache"
 	"github.com/jonhadfield/gosn-v2/common"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/pterm/pterm"
 	"github.com/urfave/cli/v2"
 )

cmd/sncli/get.go

@@ -8,7 +8,7 @@ import (
 	"github.com/jonhadfield/gosn-v2/cache"
 	"github.com/jonhadfield/gosn-v2/common"
 	"github.com/jonhadfield/gosn-v2/items"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 	"gopkg.in/yaml.v3"
 )

cmd/sncli/healthcheck.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 
 	"github.com/jonhadfield/gosn-v2/cache"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 )
 

cmd/sncli/item.go

@@ -8,7 +8,7 @@ import (
 	"github.com/jonhadfield/gosn-v2/cache"
 	"github.com/jonhadfield/gosn-v2/common"
 	"github.com/jonhadfield/gosn-v2/items"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 	"gopkg.in/yaml.v3"
 )

cmd/sncli/main.go

@@ -8,7 +8,7 @@ import (
 	"syscall"
 	"time"
 
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/spf13/viper"
 	"github.com/urfave/cli/v2"
 	"golang.org/x/term"

cmd/sncli/note.go

@@ -17,7 +17,7 @@ import (
 	"github.com/jonhadfield/gosn-v2/cache"
 	"github.com/jonhadfield/gosn-v2/common"
 	"github.com/jonhadfield/gosn-v2/items"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 	"gopkg.in/yaml.v2"
 )

cmd/sncli/organize.go

@@ -12,7 +12,7 @@ import (
 	"github.com/gookit/color"
 	"github.com/jonhadfield/gosn-v2/cache"
 	"github.com/jonhadfield/gosn-v2/common"
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 )
 

cmd/sncli/register.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"strings"
 
-	sncli "github.com/jonhadfield/sn-cli"
+	sncli "github.com/jonhadfield/sn-cli/internal/sncli"
 	"github.com/urfave/cli/v2"
 )