Implement AI orchestration wedding demo

backend/app/config.py

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+from functools import lru_cache
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """Runtime configuration shared by API, workers, and simulator."""
+
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+    app_name: str = "AI Orchestrator Wedding Demo"
+    environment: str = "local"
+    database_url: str = "sqlite:///./orchestrator.db"
+    redis_url: str = "redis://redis:6379/0"
+    qdrant_url: str = "http://qdrant:6333"
+    anthropic_api_key: str | None = None
+    anthropic_model: str = "claude-sonnet-4-6"
+    wed_api_base_url: str = "http://localhost:8000"
+    wed_api_openapi_url: str | None = None
+    wed_api_bearer_token: str | None = None
+    wed_default_partner_id: str | None = None
+    wed_guest_first_name: str = "Demo"
+    wed_guest_last_name: str = "Customer"
+    wed_guest_email: str = "demo.customer@example.com"
+    wed_guest_phone: str | None = None
+    soniox_api_key: str | None = None
+    soniox_model: str = "stt-async-preview"
+    soniox_poll_interval_seconds: float = 3.0
+    soniox_poll_attempts: int = 240
+    planner_confidence_threshold: float = 0.72
+    backend_base_url: str = "http://localhost:9000"
+    cors_origins: list[str] = Field(default_factory=lambda: ["http://localhost:5173", "http://127.0.0.1:5173"])
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()