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/storage/attach_linux.go

@@ -184,6 +184,9 @@ func FinalizeAttach(req AttachRequest, progress chan<- FormatProgress) (string,
 			errStr = err.Error()
 		}
 		progress <- FormatProgress{Step: "error", Message: msg, Error: errStr, Percent: 0}
+		if req.Logger != nil {
+			req.Logger.Printf("[ERROR] [storage] Failed to attach disk: %v", err)
+		}
 		return fmt.Errorf("%s: %w", msg, err)
 	}
 	dbg := func(format string, args ...interface{}) {
@@ -193,6 +196,9 @@ func FinalizeAttach(req AttachRequest, progress chan<- FormatProgress) (string,
 	}
 
 	mountPath := "/mnt/" + req.MountName
+	if req.Logger != nil {
+		req.Logger.Printf("[INFO] [storage] Attaching disk %s at %s", req.DevicePath, mountPath)
+	}
 	dbg("starting: device=%s mountName=%s subPath=%s", req.DevicePath, req.MountName, req.SubPath)
 
 	// --- Step 1: Validate ---
@@ -322,6 +328,9 @@ func FinalizeAttach(req AttachRequest, progress chan<- FormatProgress) (string,
 	}
 
 	dbg("attach completed successfully: %s", mountPath)
+	if req.Logger != nil {
+		req.Logger.Printf("[INFO] [storage] Disk attached successfully")
+	}
 	send("done", "Meghajtó sikeresen csatolva: "+mountPath, 100)
 
 	return mountPath, nil

controller/internal/storage/format_linux.go

@@ -27,6 +27,9 @@ func FormatAndMount(req FormatRequest, progress chan<- FormatProgress) (string,
 			errStr = err.Error()
 		}
 		progress <- FormatProgress{Step: "error", Message: msg, Error: errStr, Percent: 0}
+		if req.Logger != nil {
+			req.Logger.Printf("[ERROR] [storage] Format failed: %v", err)
+		}
 		return fmt.Errorf("%s: %w", msg, err)
 	}
 	dbg := func(format string, args ...interface{}) {
@@ -36,6 +39,9 @@ func FormatAndMount(req FormatRequest, progress chan<- FormatProgress) (string,
 	}
 
 	mountPath := "/mnt/" + req.MountName
+	if req.Logger != nil {
+		req.Logger.Printf("[INFO] [storage] Formatting disk %s as ext4", req.DevicePath)
+	}
 	dbg("starting: device=%s mountName=%s createPartition=%v", req.DevicePath, req.MountName, req.CreatePartition)
 
 	// --- Step 1: Validate ---
@@ -216,6 +222,9 @@ func FormatAndMount(req FormatRequest, progress chan<- FormatProgress) (string,
 	}
 
 	dbg("format and mount completed successfully: %s", mountPath)
+	if req.Logger != nil {
+		req.Logger.Printf("[INFO] [storage] Disk formatted and mounted at %s", mountPath)
+	}
 	send("done", "Meghajtó sikeresen inicializálva: "+mountPath, 100)
 
 	return mountPath, nil

controller/internal/storage/migrate.go

@@ -82,6 +82,9 @@ func MigrateAppData(
 			Error:          errStr,
 			ElapsedSeconds: int(time.Since(start).Seconds()),
 		}
+		if req.Logger != nil {
+			req.Logger.Printf("[ERROR] [storage] Migration %s failed at %s: %v", req.StackName, step, err)
+		}
 		return fmt.Errorf("%s: %w", msg, err)
 	}
 
@@ -91,6 +94,9 @@ func MigrateAppData(
 		}
 	}
 
+	if req.Logger != nil {
+		req.Logger.Printf("[INFO] [storage] Starting migration: stack=%s from=%s to=%s", req.StackName, req.CurrentHDDPath, req.TargetPath)
+	}
 	dbg("starting migration: stack=%s from=%s to=%s mounts=%d", req.StackName, req.CurrentHDDPath, req.TargetPath, len(req.HDDMounts))
 
 	// --- Step 1: Validate ---
@@ -196,6 +202,9 @@ func MigrateAppData(
 		return fail("starting", "Alkalmazás indítása sikertelen az új tárolóról", err)
 	}
 
+	if req.Logger != nil {
+		req.Logger.Printf("[INFO] [storage] Migration completed: stack=%s elapsed=%ds", req.StackName, int(time.Since(start).Seconds()))
+	}
 	dbg("migration completed: stack=%s bytesCopied=%d elapsed=%ds", req.StackName, bytesCopied, int(time.Since(start).Seconds()))
 	send("done",
 		fmt.Sprintf("Áthelyezés kész! Az alkalmazás az új tárolóról fut. (Régi adat: %s, idő: %ds)",

controller/internal/storage/scan_linux.go

@@ -246,6 +246,9 @@ func ScanDisks(logger *log.Logger, debug bool) (*ScanResult, error) {
 		}
 	}
 
+	if logger != nil {
+		logger.Printf("[INFO] [storage] Scanning disks")
+	}
 	dbg("starting disk scan")
 	scanStart := time.Now()
 
@@ -341,6 +344,9 @@ func ScanDisks(logger *log.Logger, debug bool) (*ScanResult, error) {
 	enrichWithBlkid(result.AvailableDisks, logger, debug)
 	enrichWithBlkid(result.SystemDisks, logger, debug)
 
+	if logger != nil {
+		logger.Printf("[INFO] [storage] Found %d disks", len(result.AvailableDisks)+len(result.SystemDisks))
+	}
 	dbg("disk scan completed in %s", time.Since(scanStart).Round(time.Millisecond))
 
 	return result, nil