Use keys for plugin manifest tabs and admin pages

[gabek]

This changes plugin manifest tabs and admin pages from arrays with repeated identifiers to objects keyed by those identifiers.

• Parse tabs by tab slug and admin.pages by plugin-relative path
• Reject legacy per-value slug and path members and duplicate keys
• Update pluginhost consumers, admin types, examples, and manifest documentation

Focused verification passed for issue #5087.

I ran the core Go tests and web production build. The keyed manifest examples and admin page flow were also exercised through the plugin scenario and browser checks.

This branch is based on the SQL SDK change already on the stack where required. It does not change unrelated plugin behavior.

Fixes owncast/owncast#5087

[Copilot]

Pull request overview

Updates the SDK templates, examples, and documentation to reflect the new keyed manifest shape for viewer tabs (manifest.tabs) and admin pages (manifest.admin.pages), replacing the legacy array-of-objects form.

Changes:

• Updated JS/Python create-owncast-plugin skills to document tabs and admin.pages as identifier-keyed objects.
• Migrated example manifests and example docs (READMEs/INSTRUCTIONS) to the keyed tabs / keyed admin.pages format.
• Updated protocol/author documentation to describe keyed shapes and ordering expectations.

Reviewed changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdks/python/owncast_plugin/template/.agents/skills/create-owncast-plugin-py/SKILL.md	Updates manifest shape notes for keyed tabs and keyed admin.pages.
sdks/js/create-owncast-plugin/template/.agents/skills/create-owncast-plugin-js/SKILL.md	Updates manifest shape notes for keyed tabs and keyed admin.pages.
rules-tab/plugin.manifest.json	Converts tabs and admin.pages to keyed-object form.
examples/python/theme-hub/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/python/tabs-demo/README.md	Updates documentation and JSON snippet for keyed tabs.
examples/python/tabs-demo/plugin.manifest.json	Converts tabs to keyed-object form.
examples/python/tabs-demo/INSTRUCTIONS.md	Updates explanation text for keyed tabs and emitted tab keys.
examples/python/README.md	Updates reference from manifest.tabs[] to manifest.tabs.
examples/python/page-content-demo/README.md	Updates JSON snippet for keyed tabs.
examples/python/page-content-demo/plugin.manifest.json	Converts tabs to keyed-object form.
examples/python/page-content-demo/INSTRUCTIONS.md	Updates JSON snippet for keyed tabs.
examples/python/manual-video-settings/README.md	Updates JSON snippet for keyed admin.pages.
examples/python/manual-video-settings/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/python/file-manager/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/python/admin-demo/plugin.manifest.json	Converts admin.pages to keyed-object form (multiple pages).
examples/python/action-buttons/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/js/theme-hub/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/js/tabs-demo/README.md	Updates documentation and JSON snippet for keyed tabs.
examples/js/tabs-demo/plugin.manifest.json	Converts tabs to keyed-object form.
examples/js/tabs-demo/INSTRUCTIONS.md	Updates explanation text for keyed tabs and emitted tab keys.
examples/js/rules-tab/plugin.manifest.json	Converts tabs and admin.pages to keyed-object form.
examples/js/README.md	Updates reference from manifest.tabs[] to manifest.tabs.
examples/js/page-content-demo/README.md	Updates JSON snippet for keyed tabs.
examples/js/page-content-demo/plugin.manifest.json	Converts tabs to keyed-object form.
examples/js/page-content-demo/INSTRUCTIONS.md	Updates JSON snippet for keyed tabs.
examples/js/manual-video-settings/README.md	Updates JSON snippet for keyed admin.pages.
examples/js/manual-video-settings/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/js/file-manager/plugin.manifest.json	Converts admin.pages to keyed-object form.
examples/js/admin-demo/plugin.manifest.json	Converts admin.pages to keyed-object form (multiple pages).
examples/js/action-buttons/plugin.manifest.json	Converts admin.pages to keyed-object form.
docs/WIRE_PROTOCOL.md	Updates protocol docs for keyed tabs / keyed admin.pages and related permission notes.
docs/PLUGIN_AUTHOR_GUIDE.md	Updates author guidance/examples for keyed tabs / keyed admin.pages.

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