feat: comprehensive INFO/WARN/ERROR logging across all controller modules

Add structured operational logging at INFO, WARN, and ERROR levels to
every controller module. Standardize custom prefixes ([GEO], [SCHED],
[SYNC]) to use [INFO/WARN/ERROR] [module] format. Fix misleveled logs
(WARN->ERROR for data loss scenarios, WARN->INFO for routine operations).

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

controller/internal/web/storage_handlers.go

@@ -1222,6 +1222,7 @@ func (s *Server) storageDisconnectHandler(w http.ResponseWriter, r *http.Request
 		return
 	}
 
+	s.logger.Printf("[INFO] [web] Disk disconnect completed: %s (stopped %d stacks)", req.Path, len(stoppedStacks))
 	if s.isDebug() {
 		s.logger.Printf("[DEBUG] [web] storageDisconnect: path=%s success, stopped %d stacks", req.Path, len(stoppedStacks))
 	}
@@ -1264,6 +1265,7 @@ func (s *Server) storageReconnectHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
+	s.logger.Printf("[INFO] [web] Disk reconnect completed: %s", req.Path)
 	if s.isDebug() {
 		s.logger.Printf("[DEBUG] [web] storageReconnect: path=%s success, previously stopped stacks=%v", req.Path, stoppedStacks)
 	}
@@ -1309,6 +1311,7 @@ func (s *Server) storageRestartAppsHandler(w http.ResponseWriter, r *http.Reques
 	}
 
 	started, failed := s.storageWatchdog.RestartStoppedApps(req.Path)
+	s.logger.Printf("[INFO] [web] Restart apps for %s: started=%d failed=%d", req.Path, len(started), len(failed))
 	if s.isDebug() {
 		s.logger.Printf("[DEBUG] [web] storageRestartApps: path=%s started=%v failed=%v", req.Path, started, failed)
 	}