fix: bare except (#1159)

Bare `except:` catches SystemExit and KeyboardInterrupt, which can:
- Mask Ctrl+C handling during long optimization runs
- Hide critical system signals
- Make debugging harder

Replacement by `except Exception:` preserves the same error handling while respecting
system-level exceptions.

Co-authored-by: Milo @KeloYuan

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

src/akkudoktoreos/prediction/feedintarifffixed.py

@@ -40,7 +40,7 @@ class FeedInTariffFixed(FeedInTariffProvider):
             feed_in_tariff = (
                 self.config.feedintariff.provider_settings.FeedInTariffFixed.feed_in_tariff_kwh
             )
-        except:
+        except Exception:
             logger.exception(error_msg)
             raise ValueError(error_msg)
         if feed_in_tariff is None: