Add custom types, version command, and restore --verify flag

- Add internal/types package with type-safe wrappers for IDs, hashes,
  paths, and credentials (FileID, BlobID, ChunkHash, etc.)
- Implement driver.Valuer and sql.Scanner for UUID-based types
- Add `vaultik version` command showing version, commit, go version
- Add `--verify` flag to restore command that checksums all restored
  files against expected chunk hashes with progress bar
- Remove fetch.go (dead code, functionality in restore)
- Clean up TODO.md, remove completed items
- Update all database and snapshot code to use new custom types

internal/database/file_chunks_test.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"testing"
 	"time"
+
+	"git.eeqj.de/sneak/vaultik/internal/types"
 )
 
 func TestFileChunkRepository(t *testing.T) {
@@ -33,7 +35,7 @@ func TestFileChunkRepository(t *testing.T) {
 	}
 
 	// Create chunks first
-	chunks := []string{"chunk1", "chunk2", "chunk3"}
+	chunks := []types.ChunkHash{"chunk1", "chunk2", "chunk3"}
 	chunkRepo := NewChunkRepository(db)
 	for _, chunkHash := range chunks {
 		chunk := &Chunk{
@@ -50,7 +52,7 @@ func TestFileChunkRepository(t *testing.T) {
 	fc1 := &FileChunk{
 		FileID:    file.ID,
 		Idx:       0,
-		ChunkHash: "chunk1",
+		ChunkHash: types.ChunkHash("chunk1"),
 	}
 
 	err = repo.Create(ctx, nil, fc1)
@@ -62,7 +64,7 @@ func TestFileChunkRepository(t *testing.T) {
 	fc2 := &FileChunk{
 		FileID:    file.ID,
 		Idx:       1,
-		ChunkHash: "chunk2",
+		ChunkHash: types.ChunkHash("chunk2"),
 	}
 	err = repo.Create(ctx, nil, fc2)
 	if err != nil {
@@ -72,7 +74,7 @@ func TestFileChunkRepository(t *testing.T) {
 	fc3 := &FileChunk{
 		FileID:    file.ID,
 		Idx:       2,
-		ChunkHash: "chunk3",
+		ChunkHash: types.ChunkHash("chunk3"),
 	}
 	err = repo.Create(ctx, nil, fc3)
 	if err != nil {
@@ -131,7 +133,7 @@ func TestFileChunkRepositoryMultipleFiles(t *testing.T) {
 
 	for i, path := range filePaths {
 		file := &File{
-			Path:       path,
+			Path:       types.FilePath(path),
 			MTime:      testTime,
 			CTime:      testTime,
 			Size:       2048,
@@ -151,7 +153,7 @@ func TestFileChunkRepositoryMultipleFiles(t *testing.T) {
 	chunkRepo := NewChunkRepository(db)
 	for i := range files {
 		for j := 0; j < 2; j++ {
-			chunkHash := fmt.Sprintf("file%d_chunk%d", i, j)
+			chunkHash := types.ChunkHash(fmt.Sprintf("file%d_chunk%d", i, j))
 			chunk := &Chunk{
 				ChunkHash: chunkHash,
 				Size:      1024,
@@ -169,7 +171,7 @@ func TestFileChunkRepositoryMultipleFiles(t *testing.T) {
 			fc := &FileChunk{
 				FileID:    file.ID,
 				Idx:       j,
-				ChunkHash: fmt.Sprintf("file%d_chunk%d", i, j),
+				ChunkHash: types.ChunkHash(fmt.Sprintf("file%d_chunk%d", i, j)),
 			}
 			err := repo.Create(ctx, nil, fc)
 			if err != nil {