feat(build): add level-based parallel builds with --parallel and configurable concurrency

ts/interfaces/index.ts

@@ -80,6 +80,8 @@ export interface IBuildCommandOptions {
   cached?: boolean;     // Skip builds when Dockerfile content hasn't changed
   verbose?: boolean;    // Stream raw docker build output (default: silent)
   context?: string;      // Explicit Docker context name (--context flag)
+  parallel?: boolean;            // Enable parallel builds within dependency levels
+  parallelConcurrency?: number;  // Max concurrent builds per level (default 4)
 }
 
 export interface ICacheEntry {