PROD-8165 add extension development/deployment documentation

[ivbond]

Description

Type of change

• New / updated documentation page (src/content/docs/**)
• Shared include file (src/content/_includes/**)
• Component, layout, or styling change (src/components/**, src/styles/**)
• Landing / use-case / case-study page (src/pages/**, src/data/**)
• Redirects (src/data/redirects.ts)
• Version bump / release (see release skill)
• Build, CI, scripts, or tooling
• Other (please describe)

Affected products

Related issues

• Closes #

Checklist

• pnpm check passes (Astro / TypeScript)
• pnpm lint:eslint passes
• pnpm lint:slugcheck passes (required if pages were added/renamed/moved across languages)
• pnpm lint:linkcheck passes locally — required to merge; run it before requesting review (use pnpm lint:linkcheck:nobuild if you already ran a build)
• Renamed/removed pages have a redirect in src/data/redirects.ts, and pnpm generate:redirects was run
• No hardcoded versions — values come from src/data/versions.ts
• Screenshots attached for visual changes

[Copilot]

Pull request overview

Adds a new “Extensions” documentation section to the ThingsBoard docs site, including end-to-end guidance for building, deploying, and operating ThingsBoard extensions, and exposes that section in the Reference navigation.

Changes:

• Introduces new Extensions reference pages (overview, quickstart, dev workflow, CLI deploy reference, REST deployment API) for CE/PE/Cloud variants via shared _includes.
• Adds Extensions links to the “APIs & SDKs” reference landing include and to the generated sidebar navigation.
• Adds new extension-related schema diagrams (light/dark variants) used by the docs.

Reviewed changes

Copilot reviewed 27 out of 41 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/content/docs/docs/reference/extensions/quickstart.mdx	CE wrapper page for Extensions quickstart include
src/content/docs/docs/reference/extensions/overview.mdx	CE wrapper page for Extensions overview include
src/content/docs/docs/reference/extensions/development-workflow.mdx	CE wrapper page for development workflow include
src/content/docs/docs/reference/extensions/deployment-api.mdx	CE wrapper page for deployment API include
src/content/docs/docs/reference/extensions/cli-deployment.mdx	CE wrapper page for CLI deployment include
src/content/docs/docs/pe/reference/extensions/quickstart.mdx	PE wrapper page for Extensions quickstart include
src/content/docs/docs/pe/reference/extensions/overview.mdx	PE wrapper page for Extensions overview include
src/content/docs/docs/pe/reference/extensions/development-workflow.mdx	PE wrapper page for development workflow include
src/content/docs/docs/pe/reference/extensions/deployment-api.mdx	PE wrapper page for deployment API include
src/content/docs/docs/pe/reference/extensions/cli-deployment.mdx	PE wrapper page for CLI deployment include
src/content/docs/docs/paas/reference/extensions/quickstart.mdx	PaaS wrapper page for Extensions quickstart include
src/content/docs/docs/paas/reference/extensions/overview.mdx	PaaS wrapper page for Extensions overview include
src/content/docs/docs/paas/reference/extensions/development-workflow.mdx	PaaS wrapper page for development workflow include
src/content/docs/docs/paas/reference/extensions/deployment-api.mdx	PaaS wrapper page for deployment API include
src/content/docs/docs/paas/reference/extensions/cli-deployment.mdx	PaaS wrapper page for CLI deployment include
src/content/docs/docs/paas/eu/reference/extensions/quickstart.mdx	PaaS EU wrapper page for Extensions quickstart include
src/content/docs/docs/paas/eu/reference/extensions/overview.mdx	PaaS EU wrapper page for Extensions overview include
src/content/docs/docs/paas/eu/reference/extensions/development-workflow.mdx	PaaS EU wrapper page for development workflow include
src/content/docs/docs/paas/eu/reference/extensions/deployment-api.mdx	PaaS EU wrapper page for deployment API include
src/content/docs/docs/paas/eu/reference/extensions/cli-deployment.mdx	PaaS EU wrapper page for CLI deployment include
src/content/_includes/docs/reference/extensions/quickstart.mdx	Shared quickstart content (Java/Python tabs + CLI workflow)
src/content/_includes/docs/reference/extensions/overview.mdx	Shared overview content (architecture, routing/auth, lifecycle, run modes)
src/content/_includes/docs/reference/extensions/development-workflow.mdx	Shared “full loop” workflow guide content
src/content/_includes/docs/reference/extensions/deployment-api.mdx	Shared REST deployment API reference content
src/content/_includes/docs/reference/extensions/cli-deployment.mdx	Shared CLI deploy/reference content
src/content/_includes/docs/reference/apis-and-sdks.mdx	Adds an “Extensions” card/links to the reference landing include
src/assets/schemas/extension-mode-self-hosted.svg	New diagram asset used in Extensions overview (light)
src/assets/schemas/extension-mode-self-hosted-dark.svg	New diagram asset used in Extensions overview (dark)
src/assets/schemas/extension-lifecycle.svg	New diagram asset used in Extensions overview (light)
src/assets/schemas/extension-lifecycle-dark.svg	New diagram asset used in Extensions overview (dark)
astro.sidebar.ts	Adds “Extensions” group under APIs & SDKs sidebar section

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