feat: align teams integration with slack parity

[hulh122]

Summary

• add Teams proactive connect welcome DMs with a one-time dmWelcomeSent guard and propagate Teams conversation context through connect flows
• add Teams command handling for help, connect, disconnect, switch, and model, plus queued-run replies and Slack-like login/welcome copy
• persist Teams run summaries, add channel/thread reply-to footer context, and expose Teams status agentOrgSlug and environment fields

Notes

• Teams attachment/file parity remains out of scope per request.
• Teams app command menu was not changed because this repo does not contain a Teams manifest/app package source; backend command handling is implemented.

Testing

• pnpm format
• pnpm turbo run lint
• pnpm check-types
• pnpm -F api lint
• pnpm -F @vm0/app lint
• pnpm -F @vm0/api-contracts lint
• pnpm -F api check-types
• pnpm -F @vm0/app check-types
• pnpm -F @vm0/api-contracts check-types
• pnpm vitest --config vitest.config.ts --run src/signals/routes/__tests__/zero-teams-connect.test.ts src/signals/routes/__tests__/zero-teams-bot.test.ts src/signals/routes/__tests__/internal-callbacks-teams.test.ts from apps/api
• pnpm vitest --config vitest.config.ts --run src/views/zero-page/__tests__/zero-teams-connect-page.test.tsx from apps/platform
• git diff --check

Known local failures outside this change:

• pnpm vitest failed in non-Teams paths: chat-threads.bdd.test.ts, cron-summarize-memory.test.ts, webhooks-callbacks.bdd.test.ts, webhooks-notion.test.ts, zero-workflow-trigger-scheduler.test.ts, two connectors firewall metadata tests, plus an async Image is not defined error from zero-jobs-page.test.tsx.
• pnpm knip failed on the existing workspace unused-code baseline, including 7 unused files, 3 unused devDependencies, and 1608 unused exports.

[codecov]

Codecov Report

❌ Patch coverage is 76.39344% with 72 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...src/signals/services/zero-teams-connect.service.ts	67.16%	44 Missing ⚠️
...rc/signals/services/zero-teams-dispatch.service.ts	82.00%	18 Missing ⚠️
.../apps/api/src/signals/external/teams-bot-client.ts	84.37%	5 Missing ⚠️
...ervices/internal-teams-org-run-callback.service.ts	69.23%	4 Missing ⚠️
...i/src/signals/routes/zero-teams-browser-connect.ts	50.00%	1 Missing ⚠️

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[github-actions]

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