Unify MCP across clients; remove legacy plugin server

cli/python/api/server.py

@@ -13,7 +13,7 @@ Modes:
 - Server: Deployed remotely, serves design systems to teams
 - Local: Dev companion, UI advisor, local services
 
-Uses SQLite for persistence, integrates with Figma tools.
+Uses JSON storage for persistence, integrates with Figma tools.
 """
 
 import json
@@ -261,10 +261,12 @@ async def health():
 
 @app.get("/api/stats")
 async def get_statistics():
-    """Get database and system statistics."""
-    db_stats = get_stats()
+    """Get storage and system statistics."""
+    storage_stats = get_stats()
     return {
-        "database": db_stats,
+        "storage": storage_stats,
+        # Backwards-compatible alias (historical naming; underlying storage is JSON files).
+        "database": storage_stats,
         "figma": {"mode": figma_suite.mode, "configured": config.figma.is_configured},
     }