added type hints all over the project, updated mypy to ignore missing types from libraries

mypy.ini

@@ -0,0 +1,31 @@
+# mypy configuration for groovy-zilean
+# Type checking configuration that's practical for a Discord bot
+
+[mypy]
+# Python version
+python_version = 3.13
+
+# Ignore missing imports for libraries without type stubs
+# Discord.py, spotipy, yt-dlp don't have complete type stubs
+ignore_missing_imports = True
+
+# Be strict about our own code
+# Start lenient, can tighten later
+disallow_untyped_defs = False
+check_untyped_defs = True
+# Too noisy with discord.py
+warn_return_any = False
+warn_unused_configs = True
+
+# Exclude patterns
+exclude = venv/
+
+# Per-module overrides
+[mypy-discord.*]
+ignore_missing_imports = True
+
+[mypy-spotipy.*]
+ignore_missing_imports = True
+
+[mypy-yt_dlp.*]
+ignore_missing_imports = True