Init first files

backend/app/core/config.py

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+from functools import lru_cache
+from pydantic import field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")
+
+    app_name: str = "NexaPG Monitor"
+    environment: str = "dev"
+    api_v1_prefix: str = "/api/v1"
+    log_level: str = "INFO"
+
+    db_host: str = "db"
+    db_port: int = 5432
+    db_name: str = "nexapg"
+    db_user: str = "nexapg"
+    db_password: str = "nexapg"
+
+    jwt_secret_key: str
+    jwt_algorithm: str = "HS256"
+    jwt_access_token_minutes: int = 15
+    jwt_refresh_token_minutes: int = 60 * 24 * 7
+
+    encryption_key: str
+    cors_origins: str = "http://localhost:5173"
+    poll_interval_seconds: int = 30
+    init_admin_email: str = "admin@example.com"
+    init_admin_password: str = "ChangeMe123!"
+
+    @property
+    def database_url(self) -> str:
+        return (
+            f"postgresql+asyncpg://{self.db_user}:{self.db_password}"
+            f"@{self.db_host}:{self.db_port}/{self.db_name}"
+        )
+
+    @property
+    def cors_origins_list(self) -> list[str]:
+        return [item.strip() for item in self.cors_origins.split(",") if item.strip()]
+
+    @field_validator("environment")
+    @classmethod
+    def validate_environment(cls, value: str) -> str:
+        allowed = {"dev", "staging", "prod", "test"}
+        if value not in allowed:
+            raise ValueError(f"environment must be one of {allowed}")
+        return value
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()