fix(scripts): repair broken sys.path setup in utility scripts

clear_cache.py and download_nba_logos.py pointed sys.path at a 'src'
directory relative to the script's own folder (scripts/utils/src and
scripts/src — neither exists), so both crashed on import; they now insert
the project root and import via the src package like the other scripts.
debug_web_manual.py resolved 'project root' to scripts/debug/ instead of
two levels up. fix_nhl_cache.sh is removed: it used Python docstring
syntax in a bash script and invoked clear_nhl_cache.py, which does not
exist anywhere in the repo — it cannot ever have worked in its current
location.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SXb4mKcAkVaxkeTb3YnAdr

scripts/debug/debug_web_manual.py

@@ -13,8 +13,8 @@ def main():
     print("🔍 LED Matrix Web Interface Debug Tool")
     print("=" * 50)
 
-    # Change to project root (where this script is located)
-    project_root = Path(__file__).parent.resolve()
+    # Change to project root (two levels up from scripts/debug/)
+    project_root = Path(__file__).parent.parent.parent.resolve()
     os.chdir(project_root)
     print(f"📁 Working directory: {os.getcwd()}")