Add SaaS workspace and advanced caption localization modeling

[devin-ai-integration]

Summary

• Adds a SaaS workspace layer with multi-client switching, team roles, export history, analytics, and import/exportable local-first workspace bundles.
• Expands the caption localizer domain engine with locale/platform review records, translation-review workflow modeling, dashboards, automation rules, SaaS plan tiers, and a standalone SaaS suite layer.
• Adds second-pass standalone product operations: locale glossary records, reviewer assignments, platform length/CTA validators, stereotype/bias checks, optional backend batch-scoring readiness, team metrics, export product metadata, and suite Markdown summaries.
• Adds tests for workspace bundle behavior, advanced domain model readiness, and standalone SaaS suite depth.

Review & Testing Checklist for Human

• Confirm the new Client portfolio dashboard supports creating/switching client workspaces.
• Load sample data and review the SaaS suite panel for module/workflow/export counts and domain-specific localization operations.
• Export the domain packet and verify glossary entries, translation review, platform validators, bias checks, backend-readiness language, and automation rules are useful.
• Export/import a SaaS workspace bundle in-browser to confirm local-first workflow expectations.

Notes

Validated locally with npm run typecheck, npm test, and npm run test:backend; earlier setup validation also ran npm ci. CI is passing after syncing generated declarations.

Link to Devin session: https://app.devin.ai/sessions/cdab2f3456df4cf08b5a9de3a9f9364c
Requested by: @volta-npo

[devin-ai-integration]

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[volta-npo]

Reviewed diff, scope, and checks. Accepted for merge.