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Add SpeechModule with provider interfaces and service skeleton for multi-tier TTS fallback (premium -> default -> fallback) and STT transcription support. Includes 27 unit tests covering provider selection, fallback logic, and availability checks. - ISTTProvider interface with transcribe/isHealthy methods - ITTSProvider interface with synthesize/listVoices/isHealthy methods - Shared types: SpeechTier, TranscriptionResult, SynthesisResult, etc. - SpeechService with graceful TTS fallback chain - NestJS injection tokens (STT_PROVIDER, TTS_PROVIDERS) - SpeechModule registered in AppModule - ConfigModule integration via speechConfig registerAs factory Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>