huge refactor of the entire codebase, with the goal of improving maintainability, readability, and extensibility. This commit includes changes to almost every file in the project, including:

SYS/rich_display.py

@@ -148,7 +148,7 @@ def show_store_config_panel(
 
 
 def show_available_providers_panel(provider_names: List[str]) -> None:
-    """Show a Rich panel listing available/configured providers."""
+    """Show a Rich panel listing available/configured plugins."""
     from rich.columns import Columns
     from rich.console import Group
 
@@ -164,13 +164,13 @@ def show_available_providers_panel(provider_names: List[str]) -> None:
     )
 
     group = Group(
-        Text("The following providers are configured and ready to use:\n"),
+        Text("The following plugins are configured and ready to use:\n"),
         cols
     )
 
     panel = Panel(
         group,
-        title="[bold green]Configured Providers[/bold green]",
+        title="[bold green]Configured Plugins[/bold green]",
         border_style="green",
         padding=(1, 2)
     )