chore(scripts): delete unreferenced helper scripts

None of these is referenced by an installer, systemd unit, CI workflow,
test, the web UI or src/:

- utils/cleanup_venv.sh removes venv_web_v2, which nothing creates
- utils/clear_python_cache.sh hardcodes ~/LEDMatrix and a .webassets-cache
  nothing uses
- install/migrate_config.sh only copies the template, which the installer
  and ConfigManager already do
- install/debug_install.sh, debug/debug_web_manual.py
- diagnose_web_ui.sh and verify_web_ui.sh overlap diagnose_web_interface.sh,
  which the docs point to
- fix_internet_connectivity.sh is iptables-only (stale on nftables)
- diagnose_plugin_permissions.sh, dev/validate_python.py
- download_nba_logos.py + README_NBA_LOGOS.md: logo_downloader fetches
  logos on demand
- setup_plugin_repos.py linked into the production plugin-repos/ dir; the
  dev workflow is scripts/dev/dev_plugin_setup.sh, and
  MULTI_ROOT_WORKSPACE_SETUP.md now uses it

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/dev/README.md

@@ -6,7 +6,6 @@ This directory contains scripts and utilities for development and testing.
 
 - **`dev_plugin_setup.sh`** - Sets up plugin development environment by linking plugin repositories
 - **`run_emulator.sh`** - Runs the LED Matrix display in emulator mode (for development without hardware)
-- **`validate_python.py`** - Validates Python files for common formatting and syntax errors
 
 ## Usage
 
@@ -30,8 +29,3 @@ links. To use a fork or another clone location, copy
 ./scripts/dev/run_emulator.sh
 ```
 
-### Validating Python Files
-```bash
-python3 scripts/dev/validate_python.py <file.py>
-```
-

scripts/dev/validate_python.py

@@ -1,95 +0,0 @@
-#!/usr/bin/env python3
-"""
-Python file validation script to prevent common formatting errors.
-
-This script checks for:
-1. Proper indentation (4 spaces, no mixed tabs/spaces)
-2. Missing imports
-3. Syntax errors
-4. Line length issues
-5. Proper try/except structure
-
-Usage: python tools/validate_python.py <python_file>
-"""
-
-import ast
-import sys
-import os
-
-def validate_file(filepath: str) -> bool:
-    """Validate a Python file for common issues."""
-    try:
-        with open(filepath, 'r', encoding='utf-8') as f:
-            content = f.read()
-
-        issues_found = []
-
-        # Check for tabs (should use spaces)
-        if '\t' in content:
-            issues_found.append("❌ Contains tabs - use 4 spaces instead")
-
-        # Check for trailing whitespace
-        lines = content.split('\n')
-        for i, line in enumerate(lines, 1):
-            if line.rstrip() != line:
-                issues_found.append(f"❌ Line {i}: Trailing whitespace")
-
-        # Check for very long lines
-        for i, line in enumerate(lines, 1):
-            if len(line) > 120:
-                issues_found.append(f"⚠️  Line {i}: Very long line ({len(line)} chars)")
-
-        # Check for proper try/except structure
-        try:
-            ast.parse(content)
-        except SyntaxError as e:
-            issues_found.append(f"❌ Syntax error: {e}")
-
-        # Check for mixed quotes (inconsistency)
-        single_quotes = content.count("'")
-        double_quotes = content.count('"')
-        if single_quotes > 0 and double_quotes > 0:
-            issues_found.append("⚠️  Mixed quote usage - consider using double quotes consistently")
-
-        # Report results
-        if issues_found:
-            print(f"\n🔍 Validation Results for: {filepath}")
-            print("=" * 50)
-            for issue in issues_found:
-                print(issue)
-            return False
-        else:
-            print(f"✅ {filepath} - All checks passed!")
-            return True
-
-    except Exception as e:
-        print(f"❌ Error reading file {filepath}: {e}")
-        return False
-
-def validate_directory(directory: str) -> bool:
-    """Validate all Python files in a directory."""
-    all_passed = True
-
-    for root, dirs, files in os.walk(directory):
-        for file in files:
-            if file.endswith('.py'):
-                filepath = os.path.join(root, file)
-                if not validate_file(filepath):
-                    all_passed = False
-
-    return all_passed
-
-if __name__ == "__main__":
-    if len(sys.argv) != 2:
-        print("Usage: python tools/validate_python.py <file_or_directory>")
-        sys.exit(1)
-
-    target = sys.argv[1]
-
-    if os.path.isfile(target):
-        validate_file(target)
-    elif os.path.isdir(target):
-        validate_directory(target)
-    else:
-        print(f"❌ Path not found: {target}")
-        sys.exit(1)