Restore Vertex AI integration for future development

[phinaldoo]

Ported from phinaldoo/chatui#962 and adapted to Omlorix's current repository layout and branding.

Purpose

This draft preserves the Vertex AI integration removed from the source repository so it can be restored and redesigned in a later release. Omlorix main already reflects that removal, so this port targets main directly rather than retaining the source PR's stacked base.

Important: not merge-ready

The restored implementation has a known authentication conflict: it requires/passes an API key while also passing Vertex project/location, which the Google Gen AI SDK rejects. Realtime and media behavior are also inconsistent. This PR is an archive and development workspace, not a functional Vertex release.

Work required before release

• Define an explicit Google AI Studio vs Vertex authentication contract.
• Make the API key optional in Vertex mode and use ADC/IAM without mixed credentials.
• Add a no-terminal Docker deployment flow using attached service accounts, Workload Identity Federation, or a securely mounted credential secret.
• Keep Electron Server Launcher and omlorix-server CLI credential setup in parity.
• Implement and test Vertex-compatible realtime transport and every media adapter.
• Update outbound-network, CSP/proxy, endpoint disclosure, import/export, and provider-status behavior.
• Add authentication, schema, runtime, and container-level tests.
• Replace the archived limitation documentation with completed setup and operational guidance.

Port validation

• Python compilation passed for changed Python files.
• node --check passed for changed JavaScript files.
• Locale JSON validation and git diff --check passed.
• Backend pytest was not available in the isolated porting environment.

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