feat: complete production-quality Model Router AI traffic control platform

backend/app/config/settings.py

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+from functools import lru_cache
+from typing import Optional
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    APP_ENV: str = "development"
+    DEBUG: bool = True
+    PORT: int = 8000
+    HOST: str = "0.0.0.0"
+
+    DATABASE_URL: str = "sqlite+aiosqlite:///./model_router.db"
+    ROUTER_ANALYZER: str = "rules"  # "rules" or "llm"
+    DEFAULT_ROUTING_POLICY: str = "balanced"
+    BASELINE_MODEL_ID: str = "mock-power"
+
+    DEFAULT_PROVIDER: str = "mock"
+    OLLAMA_BASE_URL: str = "http://localhost:11434"
+
+    # External Provider Keys (optional)
+    OPENAI_API_KEY: Optional[str] = None
+    ANTHROPIC_API_KEY: Optional[str] = None
+    GEMINI_API_KEY: Optional[str] = None
+
+    # Budgets
+    DAILY_BUDGET: float = 10.00
+    MONTHLY_BUDGET: float = 100.00
+    PER_REQUEST_BUDGET: float = 1.00
+
+    # Execution / Reliability
+    MAX_RETRIES: int = 2
+    PROVIDER_TIMEOUT_SECONDS: float = 30.0
+
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        extra="ignore",
+    )
+
+
+@lru_cache()
+def get_settings() -> Settings:
+    return Settings()