Add singleton logging configuration for the renamer application

This commit introduces a new module `logging_config.py` that implements a singleton pattern for logging configuration. The logger is initialized only once and can be configured based on an environment variable to log to a file or to the console. This centralizes logging setup and ensures consistent logging behavior throughout the application.

renamer/constants/__init__.py

@@ -12,7 +12,7 @@ This package contains constants split into logical modules:
 """
 
 # Import from all constant modules
-from .media_constants import MEDIA_TYPES
+from .media_constants import MEDIA_TYPES, META_TYPE_TO_EXTENSIONS
 from .source_constants import SOURCE_DICT
 from .frame_constants import FRAME_CLASSES, NON_STANDARD_QUALITY_INDICATORS
 from .moviedb_constants import MOVIE_DB_DICT
@@ -24,6 +24,7 @@ from .cyrillic_constants import CYRILLIC_TO_ENGLISH
 __all__ = [
     # Media types
     'MEDIA_TYPES',
+    'META_TYPE_TO_EXTENSIONS',
     # Source types
     'SOURCE_DICT',
     # Frame classes

renamer/constants/media_constants.py

@@ -54,3 +54,13 @@ MEDIA_TYPES = {
         "mime": "video/mpeg",
     },
 }
+
+# Reverse mapping: meta_type -> list of extensions
+# Built once at module load instead of rebuilding in every extractor instance
+META_TYPE_TO_EXTENSIONS = {}
+for ext, info in MEDIA_TYPES.items():
+    meta_type = info.get('meta_type')
+    if meta_type:
+        if meta_type not in META_TYPE_TO_EXTENSIONS:
+            META_TYPE_TO_EXTENSIONS[meta_type] = []
+        META_TYPE_TO_EXTENSIONS[meta_type].append(ext)