fix: sync docs with Dashboard and OpenAPI changes

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Findings

Broken

• Update Organization API key, webhook, member, and billing breadcrumbs for the new Developer and Settings navigation groups.

Wrong

• Correct the OpenAPI fileFormat examples to use supported uppercase identifiers instead of lowercase values and unsupported XML.
• Restore descriptions for six generated endpoint pages where the regenerated reference lost behavioral context.

Polish

• Make generated OpenAPI pages retain the required HTTP method badge and compliant plain-text reference descriptions.

Verification

• Installed current published GT packages in a fresh npm project (gt@2.16.3, gt-next@11.1.5, gt-react@11.1.5, generaltranslation@9.1.1) and verified the documented locale transform placeholders against the shipped CLI.
• Confirmed the merged _tagIds React option is not in published packages, so it is intentionally not documented yet.
• Regenerated OpenAPI pages twice and confirmed a clean diff.
• Passed content link, structure, reference-link, callout, and unsafe-HTML validators.
• Passed validator tests and TypeScript checks.
• Passed the 460-page production docs build.