Add automated prefect setting

src/quacc/settings.py

@@ -19,7 +19,7 @@
 installed_engine = next(
     (
         wflow_engine
-        for wflow_engine in ["parsl", "covalent", "dask", "redun", "jobflow"]
+        for wflow_engine in ["parsl", "covalent", "prefect", "dask", "redun", "jobflow"]
         if util.find_spec(wflow_engine)
     ),
     None,
@@ -40,6 +40,13 @@ class QuaccSettings(BaseSettings):
     using the "QUACC" prefix. e.g. `export QUACC_SCRATCH_DIR=/path/to/scratch`.
     """
 
+    model_config = SettingsConfigDict(
+        env_prefix="quacc_",
+        env_nested_delimiter="__",
+        extra="forbid",
+        validate_assignment=True,
+    )
+
     CONFIG_FILE: Path = Field(
         _DEFAULT_CONFIG_FILE_PATH,
         description=(
@@ -450,13 +457,6 @@ def generate_store(cls, v: Union[dict[str, dict[str, Any]], Store]) -> Store:
         else:
             return v
 
-    model_config = SettingsConfigDict(
-        env_prefix="quacc_",
-        env_nested_delimiter="__",
-        extra="forbid",
-        validate_assignment=True,
-    )
-
     @model_validator(mode="before")
     @classmethod
     def load_user_settings(cls, settings: dict[str, Any]) -> dict[str, Any]: