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/handler_restore.go

@@ -89,6 +89,7 @@ func (s *Server) apiRestoreAll(w http.ResponseWriter, r *http.Request) {
 		jsonError(w, "restore already in progress", http.StatusConflict)
 		return
 	}
+	s.logger.Printf("[INFO] [web] Restore-all initiated from %s", r.RemoteAddr)
 	go s.executeAllRestores()
 
 	jsonResponse(w, map[string]interface{}{