feat: Add patches functionality

[ivanpadavan]

What is this PR about?

This PR introduces a new Patches system for Applications and Docker Compose services — a powerful way to customize deployments directly from the dashboard without maintaining complex forks.

While there are many "ready-to-work" repositories available, most require slight modifications to run correctly on a self-hosted instance. This feature dramatically improves the user experience by making it easy to apply small, persistent fixes to any service.

How It Works:
Users can apply persistent modifications (Git patches) to source code or configuration files (like docker-compose.yml) directly from the Dokploy UI. These patches are automatically applied before every build or deployment.

Key Features:

• Persistent Customization: Changes survive redeployments and updates from the upstream repository.
• In-Browser Editor: A new "Patches" tab allows users to browse files, edit content, and generate patches automatically without leaving the browser.
• Safety: Uses standard git apply mechanics; if the source file changes drastically, the patch fails safely, preventing silent breakages.

Implementation Details:

• Backend: introduced a Patch entity and a PatchService to handle git operations (clone, diff, apply).
• Deployment Pipeline: Integrated a patch application step into the deployment workflow for both Applications and Compose services.
• Frontend: Added a file browser and code editor for managing patches.

I understand that the UI/UX and test coverage are open points for discussion. If you are open to including this feature in the product, I am ready to polish it further based on your feedback.

You can preview the implementation here: https://github.com/ivanpadavan/dokploy-patches

Checklist

Before submitting this PR, please make sure that:

• You created a dedicated branch based on the canary branch.
• You have read the suggestions in the CONTRIBUTING.md file https://github.com/Dokploy/dokploy/blob/canary/CONTRIBUTING.md#pull-request
• You have tested this PR in your local instance.

Issues related (if applicable)

(If there is a feature request issue for this, link it here, e.g. closes #123)

Screenshots

Patches Tab (Empty State)

Creating/Editing a Patch

Patches List