fix: spurious health alerts, show rotated logs, clear history button

app.py:
- Alert logic now checks status.running (container up/down) instead of healthy
  (which requires connectivity tests) — services are only alerted when actually down
- Add POST /api/health/history/clear endpoint to reset history + alert counters

log_manager.py:
- get_all_log_file_infos: include rotated backup files (*.log.1, *.log.2 ...) in listing,
  marked with backup=true so UI can dim them and hide rotate button

api.js: add monitoringAPI.clearHealthHistory

Logs page:
- Health History: add Clear button with confirmation
- File panel: show full filename (including .log.1 backups), explain host path and naming,
  hide rotate button for backup files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/log_manager.py

@@ -520,19 +520,29 @@ class LogManager:
         }
 
     def get_all_log_file_infos(self) -> List[Dict[str, Any]]:
-        """Return size/mtime info for all service log files."""
+        """Return size/mtime info for active and rotated service log files."""
         results = []
-        for log_file in sorted(self.log_dir.glob('*.log')):
-            try:
-                stat = log_file.stat()
-                results.append({
-                    'name': log_file.stem,
-                    'file': log_file.name,
-                    'size': stat.st_size,
-                    'modified': datetime.fromtimestamp(stat.st_mtime).isoformat(),
-                })
-            except Exception:
-                pass
+        # Active logs (*.log) then rotated backups (*.log.1, *.log.2, ...)
+        patterns = ['*.log', '*.log.*']
+        seen = set()
+        for pattern in patterns:
+            for log_file in sorted(self.log_dir.glob(pattern)):
+                if log_file in seen or log_file.suffix == '.gz':
+                    continue
+                seen.add(log_file)
+                try:
+                    stat = log_file.stat()
+                    name = log_file.name
+                    is_backup = not name.endswith('.log')
+                    results.append({
+                        'name': log_file.stem.split('.')[0],  # service name
+                        'file': name,
+                        'size': stat.st_size,
+                        'modified': datetime.fromtimestamp(stat.st_mtime).isoformat(),
+                        'backup': is_backup,
+                    })
+                except Exception:
+                    pass
         return results
 
     def compress_old_logs(self):