Imports https://github.com/dyad-sh/dyad.git as a git submodule for third-party code integration.

Changes

• Submodule: Added third_party/dyad pointing to dyad main branch (commit fadfbc0)
• Documentation: Updated README.md with submodule initialization instructions
• License attribution: Added NOTICE file referencing dyad's Apache 2.0 license

Usage

After cloning, initialize submodules:

git submodule update --init --recursive

Details

This pull request was created as a result of the following prompt from Copilot chat.

Import the external repository https://github.com/dyad-sh/dyad.git into wasalstor-web/saas by adding it as a git submodule located at third_party/dyad.

Acceptance criteria:

• Create a new branch import/dyad-submodule from the repository default branch.
• Add the submodule pointing to https://github.com/dyad-sh/dyad.git at path third_party/dyad using the default branch HEAD of the dyad repo.
• Initialize and update any nested submodules inside dyad.
• Update README.md to document the added submodule and include instructions to initialize and update submodules: git submodule update --init --recursive.
• Ensure the dyad LICENSE is referenced in third_party/dyad/LICENSE or a top-level LICENSE/NOTICE entry is added describing the included code and its license.
• Open a pull request titled "Import dyad repository as a git submodule at third_party/dyad" with a clear description that includes source repo URL, submodule path, branch created, and any build/runtime implications. Include contribution template/checklist items if repository requires them.

If adding the submodule fails due to repository policies, fallback to copying dyad sources into third_party/dyad and include the dyad LICENSE with attribution.

Do not modify unrelated files beyond README and top-level license/NOTICE files as needed.

This task should make it straightforward for maintainers to review and accept the external code import.

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