Initial InfraPulse scaffold

backend/app/core/config.py

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+from functools import lru_cache
+
+from pydantic import AnyHttpUrl, Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+    infrapulse_env: str = "development"
+    infrapulse_secret_key: str = Field(default="change-me", min_length=8)
+    database_url: str = "postgresql+psycopg://infrapulse:infrapulse@postgres:5432/infrapulse"
+    redis_url: str = "redis://redis:6379/0"
+    frontend_url: AnyHttpUrl | str = "http://localhost:5173"
+    backend_url: AnyHttpUrl | str = "http://localhost:8000"
+    initial_admin_email: str = "admin@example.com"
+    initial_admin_password: str = "change-me"
+    access_token_expire_minutes: int = 60 * 12
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()
+
+
+settings = get_settings()