Feature/soccer scroll support (#186)

* fix: Use plugin.modes instead of manifest.json for available modes

- Display controller now checks plugin_instance.modes first before falling back to manifest
- This allows plugins to dynamically provide modes based on enabled leagues
- Fixes issue where disabled leagues (WNBA, NCAAW) appeared in available modes
- Plugins can now control their available modes at runtime based on config

* fix: Handle permission errors when removing plugin directories

- Added _safe_remove_directory() method to handle permission errors gracefully
- Fixes permissions on __pycache__ directories before removal
- Updates uninstall_plugin() and install methods to use safe removal
- Resolves [Errno 13] Permission denied errors during plugin install/uninstall

* debug(display): Change FPS check logging from debug to info level

- Change FPS check log from DEBUG to INFO to help diagnose scrolling FPS issues
- Add active_mode to log message for clarity
- Helps identify if plugins are being detected for high-FPS mode

* debug(display): Add logging for display_interval in both FPS loops

- Log display_interval when entering high-FPS and normal loops
- Shows expected FPS for high-FPS mode
- Helps diagnose why news ticker shows 50 FPS despite high-FPS detection

* feat: Update soccer-scoreboard submodule with scroll display support

- Submodule now includes full feature parity with football-scoreboard
- Granular display modes for 8 leagues (24 total modes)
- Scroll display mode with game_renderer.py and scroll_display.py
- League registry system with enabled state filtering
- Modernized config_schema.json with per-league scroll settings
- League-aware logo caching to prevent collisions
- Pillow 8.x compatibility for image resampling

Submodule branch: feature/football-feature-parity
Commit: e22a16d

* style(web): Update plugin button colors and reorganize documentation

- Change update button color to yellow-600 in installed plugins section to match plugin config page
- Change refresh plugins button color to blue-600 to match restart display button
- Move DEVELOPMENT.md and MIGRATION_GUIDE.md from root to docs/ directory
- Remove IMPACT_EXPLANATION.md and MERGE_CONFLICT_RESOLUTION_PLAN.md

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Co-authored-by: Chuck <chuck@example.com>

web_interface/static/v3/plugins_manager.js

@@ -1385,7 +1385,7 @@ function renderInstalledPlugins(plugins) {
                         data-action="configure">
                     <i class="fas fa-cog mr-2"></i>Configure
                 </button>
-                <button class="btn bg-gray-600 hover:bg-gray-700 text-white px-4 py-2 rounded-md text-sm flex-1 font-semibold"
+                <button class="btn bg-yellow-600 hover:bg-yellow-700 text-white px-4 py-2 rounded-md text-sm flex-1 font-semibold"
                         data-plugin-id="${escapedPluginId}"
                         data-action="update">
                     <i class="fas fa-sync mr-2"></i>Update