Move StartTime initialization to application startup hook

- Remove StartTime initialization from globals.New()
- Add setupGlobals function in app.go to set StartTime during fx OnStart
- Simplify globals package to be just a key/value store
- Remove fx dependencies from globals test

internal/database/file_chunks.go

@@ -78,3 +78,8 @@ func (r *FileChunkRepository) DeleteByPath(ctx context.Context, tx *sql.Tx, path
 
 	return nil
 }
+
+// GetByFile is an alias for GetByPath for compatibility
+func (r *FileChunkRepository) GetByFile(ctx context.Context, path string) ([]*FileChunk, error) {
+	return r.GetByPath(ctx, path)
+}