Refactor blob storage to use UUID primary keys and implement streaming chunking

- Changed blob table to use ID (UUID) as primary key instead of hash
- Blob records are now created at packing start, enabling immediate chunk associations
- Implemented streaming chunking to process large files without memory exhaustion
- Fixed blob manifest generation to include all referenced blobs
- Updated all foreign key references from blob_hash to blob_id
- Added progress reporting and improved error handling
- Enforced encryption requirement for all blob packing
- Updated tests to use test encryption keys
- Added Cyrillic transliteration to README

internal/database/repositories_test.go

@@ -71,7 +71,8 @@ func TestRepositoriesTransaction(t *testing.T) {
 
 		// Create blob
 		blob := &Blob{
-			BlobHash:  "tx_blob1",
+			ID:        "tx-blob-id-1",
+			Hash:      "tx_blob1",
 			CreatedTS: time.Now().Truncate(time.Second),
 		}
 		if err := repos.Blobs.Create(ctx, tx, blob); err != nil {
@@ -80,7 +81,7 @@ func TestRepositoriesTransaction(t *testing.T) {
 
 		// Map chunks to blob
 		bc1 := &BlobChunk{
-			BlobHash:  blob.BlobHash,
+			BlobID:    blob.ID,
 			ChunkHash: chunk1.ChunkHash,
 			Offset:    0,
 			Length:    512,
@@ -90,7 +91,7 @@ func TestRepositoriesTransaction(t *testing.T) {
 		}
 
 		bc2 := &BlobChunk{
-			BlobHash:  blob.BlobHash,
+			BlobID:    blob.ID,
 			ChunkHash: chunk2.ChunkHash,
 			Offset:    512,
 			Length:    512,