fix(quota-stats): show providers with quota data even if zero requests

Previously, providers were hidden from the TUI if they had 0 total_requests.
This meant quota-tracked providers like Lightning AI would never appear until
a request was made through them.

Now providers are included if they have either:
- Any requests (existing behaviour)
- Any quota group with a populated limit (new: shows quota-only providers)

Author: b3nw

src/rotator_library/client/rotating_client.py

@@ -524,8 +524,17 @@ async def get_quota_stats(
 
             stats = await manager.get_stats_for_endpoint()
 
-            # Skip providers with no activity (filters out invalid/unused providers)
-            if stats.get("total_requests", 0) == 0:
+            # Skip providers with no activity AND no quota data
+            # (filters out invalid/unused providers, but keeps quota-tracked providers visible)
+            has_requests = stats.get("total_requests", 0) > 0
+            has_quota_data = any(
+                any(
+                    ws.get("total_max", 0) > 0
+                    for ws in group_stats.get("windows", {}).values()
+                )
+                for group_stats in stats.get("quota_groups", {}).values()
+            )
+            if not has_requests and not has_quota_data:
                 continue
 
             providers[provider] = stats