Move the agent guides to the nextcloud-skills repository

[oleksandr-nc]

The agent-facing guides now live in a dedicated public skills repository that any AI agent can use (Claude, ChatGPT, Gemini and the rest): https://github.com/oleksandr-nc/nextcloud-skills

It carries everything that lived here under docs/appapi/ plus the operational half of AGENTS.md and the APPS.md catalog, and adds runbooks this repo never had: a full nextcloud-docker-dev environment guide, ExApp development in any language with a runnable reference app, and an AI maintenance loop for installed ExApps. The content was re-verified against NC 35 / AppAPI 35.0.0-dev.1 / HaRP 0.4.3, and the repository is planned to move under the Nextcloud organization later (GitHub redirects will keep the links working).

This PR removes the moved files, slims AGENTS.md down to what is specific to this repository (developing app_api itself), drops the dead /docs and /APPS.md entries from .nextcloudignore and points everything else at the new home.

Replaces #962.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

Review profile: CHILL

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Run ID: 7f0f4874-82f4-4388-8f7c-3fe23179dc73

📥 Commits

Reviewing files that changed from the base of the PR and between acb342f and 3c6b7e9.

📒 Files selected for processing (7)

• .nextcloudignore
• AGENTS.md
• APPS.md
• docs/appapi/aio.md
• docs/appapi/exapp-contract.md
• docs/appapi/kubernetes.md
• docs/appapi/remote-daemon.md

💤 Files with no reviewable changes (6)

• docs/appapi/kubernetes.md
• docs/appapi/exapp-contract.md
• .nextcloudignore
• docs/appapi/remote-daemon.md
• APPS.md
• docs/appapi/aio.md

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📝 Walkthrough

Walkthrough

The change streamlines AGENTS.md around repository development and links operational AppAPI and ExApp guidance to nextcloud-skills. It updates related links and portability guidance. It removes APPS.md and several AppAPI runbooks. It also removes /APPS.md and /docs from .nextcloudignore.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: moving the agent-facing guides to the nextcloud-skills repository.
Description check	✅ Passed	The description directly explains the guide migration, removed files, updated references, and reduced repository-specific guidance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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