fix(types): resolve mypy errors in config.py

Author: medeirosdev

src/trueentropy/config.py

@@ -27,6 +27,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
+from typing import Any, Literal
 
 # -----------------------------------------------------------------------------
 # Source Metadata
@@ -136,7 +137,7 @@ def disabled_sources(self) -> set[str]:
         Returns:
             Set of disabled source names
         """
-        return ALL_SOURCES - self.enabled_sources
+        return set(ALL_SOURCES - self.enabled_sources)
 
     # -------------------------------------------------------------------------
     # Methods
@@ -166,7 +167,7 @@ def get_source_info(self, source: str) -> dict[str, bool]:
             "requires_network": source in NETWORK_SOURCES,
         }
 
-    def copy(self, **changes) -> TrueEntropyConfig:
+    def copy(self, **changes: Any) -> TrueEntropyConfig:
         """
         Create a copy of this config with optional changes.