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.go

@@ -1,10 +1,7 @@
 package globals
 
 import (
-	"context"
 	"time"
-
-	"go.uber.org/fx"
 )
 
 // these get populated from main() and copied into the Globals object.
@@ -21,19 +18,13 @@ type Globals struct {
 	StartTime time.Time
 }
 
-func New(lc fx.Lifecycle) (*Globals, error) {
+func New() (*Globals, error) {
 	n := &Globals{
-		Appname: Appname,
-		Version: Version,
-		Commit:  Commit,
+		Appname:   Appname,
+		Version:   Version,
+		Commit:    Commit,
+		StartTime: time.Now(),
 	}
-	
-	lc.Append(fx.Hook{
-		OnStart: func(ctx context.Context) error {
-			n.StartTime = time.Now()
-			return nil
-		},
-	})
-	
+
 	return n, nil
 }