Implement local SQLite index database with repositories

- Add SQLite database connection management with proper error handling
- Implement schema for files, chunks, blobs, and snapshots tables
- Create repository pattern for each database table
- Add transaction support with proper rollback handling
- Integrate database module with fx dependency injection
- Make index path configurable via VAULTIK_INDEX_PATH env var
- Add fatal error handling for database integrity issues
- Update DESIGN.md to clarify file_chunks vs chunk_files distinction
- Remove FinalHash from BlobInfo (blobs are content-addressable)
- Add file metadata support (mtime, ctime, mode, uid, gid, symlinks)

internal/globals/globals_test.go

@@ -2,7 +2,7 @@ package globals
 
 import (
 	"testing"
-	
+
 	"go.uber.org/fx"
 	"go.uber.org/fx/fxtest"
 )
@@ -15,22 +15,22 @@ func TestGlobalsNew(t *testing.T) {
 			if g == nil {
 				t.Fatal("Globals instance is nil")
 			}
-			
+
 			if g.Appname != "vaultik" {
 				t.Errorf("Expected Appname to be 'vaultik', got '%s'", g.Appname)
 			}
-			
+
 			// Version and Commit will be "dev" and "unknown" by default
 			if g.Version == "" {
 				t.Error("Version should not be empty")
 			}
-			
+
 			if g.Commit == "" {
 				t.Error("Commit should not be empty")
 			}
 		}),
 	)
-	
+
 	app.RequireStart()
 	app.RequireStop()
-}
+}