feat: Resilienz (Fallback-Ketten) und Metriken (#5)
- Fallback-Provider (app/providers/fallback.py) fuer STT/LLM/TTS: Provider-Kette der Reihe nach; Config *_FALLBACK; build_orchestrator baut Ketten (dedupliziert) - LLM-Stream-Fallback nur solange kein Token gesendet wurde - Metriken (app/metrics.py): In-Memory Counter/Timer, keine externe Dependency - HTTP-Middleware (Requests/Latenz/Status je Pfad); Pipeline-Stufen-Timing stt/llm/tts; Fallback-/Fehlerzaehler; GET /api/metrics (JSON + Prometheus) - Tests: 58 gruen (+6); Doku aktualisiert (README, BEDIENUNGSANLEITUNG, Architektur, .env.example) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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@ -124,6 +124,9 @@ class Settings(BaseSettings):
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admin_api_key: str = ""
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auth_enabled: bool = True
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history_max_messages: int = 10
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stt_fallback: str = "" # kommaseparierte Provider-Namen (Fallback-Kette)
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llm_fallback: str = ""
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tts_fallback: str = ""
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model_config = SettingsConfigDict(
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env_file=ENV_FILE, case_sensitive=False, extra="ignore"
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)
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