Restore Deepgram speech provider support

[phinaldoo]

Ported from phinaldoo/chatui#960 and adapted to Omlorix's current repository layout and branding.

Purpose

Preserve the complete Deepgram integration removed in the source repository so it can be updated and reintroduced later.

Restored scope

• Deepgram provider enum and configuration schemas
• Provider creation, update, testing, and model discovery
• Speech-to-text and text-to-speech adapters
• Audio models, voices, formats, pricing, and runtime dispatch
• Outbound-network policy and telemetry integration
• Admin UI labels, icons, translations, feature inventory, and tests

The port retains the newer ElevenLabs model-discovery behavior already present on Omlorix main. The source repository's removed data-governance subsystem was not reintroduced.

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.

Related documentation restoration PR: https://github.com/phinaldoo/main/pull/633

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