Add "Task" build and development process with Taskfile integration

- Added Taskfile.yml to streamline build, development, and testing tasks.
- Updated README to reflect new build instructions and development environment setup using `go-task`.
- Included `.taskfile.env` and `.task` in .dockerignore and .gitignore for better environment management.
- Modified asset loading in verifier.ts to include integrity and cross-origin attributes for security.
- Updated SRI generation script to handle both directory and single file inputs for improved flexibility.

frontend/.gitignore

@@ -21,3 +21,6 @@ Thumbs.db
 # Vite
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
+
+.taskfile.env
+.task