feat(settings): add validation for settings.json to ensure required configuration is present

fix(usage_stats): handle initialization errors for usage statistics when no valid paths are configured, fixes #375

py/routes/stats_routes.py

@@ -33,7 +33,13 @@ class StatsRoutes:
         self.lora_scanner = await ServiceRegistry.get_lora_scanner()
         self.checkpoint_scanner = await ServiceRegistry.get_checkpoint_scanner()
         self.embedding_scanner = await ServiceRegistry.get_embedding_scanner()
-        self.usage_stats = UsageStats()
+        
+        # Only initialize usage stats if we have valid paths configured
+        try:
+            self.usage_stats = UsageStats()
+        except RuntimeError as e:
+            logger.warning(f"Could not initialize usage statistics: {e}")
+            self.usage_stats = None
 
     async def handle_stats_page(self, request: web.Request) -> web.Response:
         """Handle GET /statistics request"""

py/utils/usage_stats.py

@@ -67,8 +67,9 @@ class UsageStats:
     def _get_stats_file_path(self) -> str:
         """Get the path to the stats JSON file"""
         if not config.loras_roots or len(config.loras_roots) == 0:
-            # Fallback to temporary directory if no lora roots
-            return os.path.join(config.temp_directory, self.STATS_FILENAME)
+            # If no lora roots are available, we can't save stats
+            # This will be handled by the caller
+            raise RuntimeError("No LoRA root directories configured. Cannot initialize usage statistics.")
         
         # Use the first lora root
         return os.path.join(config.loras_roots[0], self.STATS_FILENAME)