Add app management: disable bundled Nextcloud apps during provisioning

[Copilot]

Adds the ability to disable Nextcloud apps post-deployment via the Docker Engine exec API, with automatic readiness polling before executing commands.

Configuration

NextcloudConfiguration gains a disabledApps parameter (defaults to [], backward compatible):

let container = try await NextcloudContainerManager.deploy(
    configuration: NextcloudConfiguration(
        tag: tag,
        disabledApps: [
            "bruteforcesettings",
            "firstrunwizard",
            "nextcloud_announcements",
            "password_policy",
        ]
    )
)

Provisioning pipeline

• Readiness polling — waitUntilReady() polls status.php every 2s until installed: true (120s timeout). Skipped entirely when disabledApps is empty.
• App disabling — Each app runs as an independent php occ app:disable <app> exec via the Docker API (POST /containers/{id}/exec → POST /exec/{id}/start detached → poll GET /exec/{id}/json). Individual failures are swallowed per requirements.
• Exec polling has a 30s per-command timeout to prevent hangs.

New types

• CreateExecRequest, CreateExecResponse, StartExecRequest, ExecInspectResponse — Docker exec API models
• NextcloudStatus — status.php response model

Other changes

• DockerEngineClient — added get() method
• DockerClientError — added timeout case

Original prompt

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This section details on the original issue you should resolve

<issue_title>Managing Apps</issue_title>
<issue_description>As part of provisioning, some bundled apps which are enabled by default should be possible to disable. Examples for test environments:

• Brute-force settings (bruteforcesettings)
• First run wizard (firstrunwizard)
• Nextcloud announcements (nextcloud_announcements)
• Password policy (password_policy)

Technical Details

• Nextcloud server apps can be disabled in the command line by using the ./occ app:disabled <app> command. This requires to SSH into the Docker container as www-data and run the Nextcloud server command line occ in the directory /var/www/html. Probably this is easier and cleaner by using the Docker Engine API to run commands inside a container.
• The disabling of an app should not interrupt the whole provisioning. Every individual disabling must be run as a dedicated command which may fail without breaking the following ones.
• It is necessary to wait for Nextcloud server to be fully operational after deployment first. This can be achieved by polling the status page until it indicates installed status.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Managing Apps #1

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