v0.24.0 — Pre-testing observability: debug logging, diagnostic dump, startup self-test

- Add [DEBUG] logging across all modules (backup, storage, sync, selfupdate,
  monitor, notify, report, assets, setup) gated behind logging.level: "debug"
- Add /api/debug/dump endpoint returning full controller state JSON (debug only)
- Add startup self-test validating 9 subsystems (Docker, dirs, storage, hub,
  restic repos, metrics DB) with pass/warn/fail summary
- New packages: internal/selftest, internal/util
- Constructor/signature changes: debug bool params, logger params on
  RunHealthCheck and BuildReport, smart watchdog probe logging

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

controller/internal/storage/format.go

@@ -3,16 +3,19 @@ package storage
 import (
 	"bufio"
 	"fmt"
+	"log"
 	"strings"
 )
 
 // FormatRequest holds parameters for formatting and mounting a disk.
 type FormatRequest struct {
-	DevicePath      string // "/dev/sdb" or "/dev/sdb1"
-	MountName       string // "hdd_1" → mounts at /mnt/hdd_1
-	Label           string // Display label for the UI
-	CreatePartition bool   // If true, create a single partition first (wipes disk)
-	SetDefault      bool   // Register as default storage path
+	DevicePath      string      // "/dev/sdb" or "/dev/sdb1"
+	MountName       string      // "hdd_1" → mounts at /mnt/hdd_1
+	Label           string      // Display label for the UI
+	CreatePartition bool        // If true, create a single partition first (wipes disk)
+	SetDefault      bool        // Register as default storage path
+	Logger          *log.Logger // Optional logger for debug output
+	Debug           bool        // Enable debug logging
 }
 
 // FormatProgress tracks the formatting/mounting progress.