Add .dokploy.json local project config to skip interactive prompts #25

Currently every command requires either passing --projectId/--environmentId/--applicationId flags or going through interactive selection each time. It would be useful to have a per-directory config file that stores these defaults.

Proposed feature

A .dokploy.json file that can be placed in any project directory:

{
  "projectId": "abc123",
  "environmentId": "def456",
  "applicationId": "ghi789"
}

A new dokploy init command to create it interactively, and all existing commands would read this file (walking up parent directories) to fill in missing flags before prompting.

Example usage

$ cd ~/my-app
$ dokploy init              # select project/environment/app once
$ dokploy app deploy -y     # no prompts needed
$ dokploy env pull .env     # knows which project/environment to use

CLI flags would always take priority over .dokploy.json values.