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/sync/sync.go

@@ -178,8 +178,11 @@ func (s *Syncer) doSync() SyncResult {
 
 	result := SyncResult{OK: true}
 
+	s.logger.Printf("[INFO] [sync] Starting catalog sync")
+
 	// Step 1: Clone or pull
 	if err := s.gitCloneOrPull(); err != nil {
+		s.logger.Printf("[ERROR] [sync] Catalog sync failed: %v", err)
 		s.mu.Lock()
 		s.lastErr = err
 		s.lastSync = time.Now()
@@ -190,6 +193,7 @@ func (s *Syncer) doSync() SyncResult {
 	// Step 2: Copy templates to stacks dir
 	newApps, updated, err := s.copyTemplates()
 	if err != nil {
+		s.logger.Printf("[ERROR] [sync] Catalog sync failed: %v", err)
 		s.mu.Lock()
 		s.lastErr = err
 		s.lastSync = time.Now()
@@ -229,6 +233,8 @@ func (s *Syncer) doSync() SyncResult {
 		result.Message = "Sablonok frissítve — " + strings.Join(parts, "; ")
 	}
 
+	s.logger.Printf("[INFO] [sync] Catalog sync complete")
+
 	s.mu.Lock()
 	s.lastErr = nil
 	s.lastSync = time.Now()
@@ -344,7 +350,7 @@ func (s *Syncer) copyTemplates() (newApps []string, updated []string, err error)
 
 			changed, err := copyIfChanged(src, dst)
 			if err != nil {
-				s.logger.Printf("[SYNC] Failed to copy %s/%s: %v", appName, filename, err)
+				s.logger.Printf("[WARN] [sync] Failed to copy catalog file %s/%s: %v", appName, filename, err)
 				continue
 			}
 			if changed {