Primera versión del backend

backend/app/core/config.py

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+from functools import lru_cache
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    app_name: str = "GenExamenes IA"
+    environment: str = "local"
+    api_prefix: str = ""
+    api_key: str = Field(min_length=16)
+    database_url: str = "postgresql+psycopg://genexamenes:genexamenes@localhost:5432/genexamenes"
+    allowed_origins: str = "http://localhost:3000"
+    rate_limit_requests: int = Field(default=60, ge=1)
+    rate_limit_window_seconds: int = Field(default=60, ge=1)
+    max_request_bytes: int = Field(default=1_048_576, ge=1_024)
+    llm_api_key: str | None = None
+    llm_base_url: str = "https://api.openai.com/v1"
+    llm_model: str = "gpt-4o-mini"
+    llm_timeout_seconds: int = Field(default=60, ge=5)
+
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        case_sensitive=False,
+        extra="ignore",
+    )
+
+    @property
+    def cors_origins(self) -> list[str]:
+        return [origin.strip() for origin in self.allowed_origins.split(",") if origin.strip()]
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()