fix: Improve provider update error handling and add VRM provider settings validation (#887)

* fix: improve error handling for provider updates

Distinguishes failures of active providers from inactive ones.
Propagates errors only for enabled providers, allowing execution
to continue if a non-active provider fails, which avoids unnecessary
interruptions and improves robustness.

* fix: add provider settings validation for forecast requests

Prevents potential runtime errors by checking if provider settings are configured
before accessing forecast credentials.

Raises a clear error when settings are missing to help with debugging misconfigurations.

* refactor(load): move provider settings to top-level fields

Transitions load provider settings from a nested "provider_settings" object with provider-specific keys to dedicated top-level fields.\n\nRemoves the legacy "provider_settings" mapping and updates migration logic to ensure backward compatibility with existing configurations.

* docs: update version numbers and documantation

---------

Co-authored-by: Normann <github@koldrack.com>

src/akkudoktoreos/core/dataabc.py

@@ -1982,8 +1982,14 @@ class DataContainer(SingletonMixin, DataABC, MutableMapping):
                 provider.update_data(force_enable=force_enable, force_update=force_update)
             except Exception as ex:
                 error = f"Provider {provider.provider_id()} fails on update - enabled={provider.enabled()}, force_enable={force_enable}, force_update={force_update}: {ex}"
-                logger.error(error)
-                raise RuntimeError(error)
+                if provider.enabled():
+                    # The active provider failed — this is a real error worth propagating.
+                    logger.error(error)
+                    raise RuntimeError(error)
+                else:
+                    # A non-active provider failed (e.g. missing config while force_enable=True).
+                    # Log as warning and continue so the remaining providers still run.
+                    logger.warning(error)
 
     def key_to_series(
         self,