v0.25.0 — Debug page: operator testing & diagnostics dashboard

Debug-mode-only dashboard (/debug) with 8 collapsible sections:
system diagnostics, notification testing, backup triggers, storage
simulation, hub & connectivity, self-update dry-run, DR/setup wizard,
and in-memory log viewer. Migrates debug dump from API router to web
server. Adds ring buffer log capture, storage disconnect simulation,
event history tracking, and cross-drive/self-update test methods.

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

CHANGELOG.md

@@ -1,5 +1,41 @@
 ## Changelog
 
+### v0.25.0 — Debug Page: Operator Testing & Diagnostics Dashboard (2026-02-21)
+
+**Full debug dashboard with 8 sections for testing all controller subsystems in debug mode.**
+
+Only available when `logging.level: "debug"` — sidebar link, page, and all `/api/debug/*` endpoints return 404 otherwise.
+
+#### New files
+- `internal/web/logbuffer.go` — Ring buffer (1000 entries) implementing `io.Writer` for capturing log output. Parses Go standard log format (with/without `Lshortfile`), extracts level/source/timestamp. Supports filtered retrieval by level and timestamp.
+- `internal/web/handler_debug.go` — Debug page handler + 20 API endpoint handlers organized in 8 sections. `DebugCallbacks` struct (6 fields) for wiring main.go closures.
+- `internal/web/templates/debug.html` — Full debug dashboard template with 8 collapsible sections, complete JS framework (lazy-load, polling, action buttons, log viewer with filter/auto-refresh).
+
+#### Debug page sections
+1. **Rendszer diagnosztika** — Diagnostic dump (migrated from `api/router.go`) with structured UI rendering: controller info, storage paths, deployed stacks, scheduler jobs, alerts. JSON download button.
+2. **Értesítés teszt** — Send test events with configurable type/severity, view event history ring buffer (last 50 events, newest first).
+3. **Mentés teszt** — Trigger individual backup phases: full backup, DB dump only, cross-drive only, restic integrity check, infrastructure backup.
+4. **Tárhely teszt** — Storage watchdog status table with per-path probe state. Simulate disconnect (stops apps, marks disconnected, skips unmount) and reconnect (cleans locks, clears state). 5s auto-refresh.
+5. **Hub & Kapcsolatok** — Hub report push, infra backup push, Hub/Gitea connectivity tests with latency, preference sync.
+6. **Önfrissítés teszt** — Version check + dry-run (shows current/new image lines, compose writability, backup status).
+7. **DR / Telepítő varázsló** — Infra backup status per drive (files, timestamps). "RESET" confirmation + infra backup pre-check before triggering setup mode via marker file.
+8. **Naplóviewer** — In-memory log viewer with level filter (DEBUG/INFO/WARN/ERROR), 2s auto-refresh, color-coded entries, clear display.
+
+#### Module additions
+- `notify/notifier.go`: `PushTestEventSync()` (synchronous, returns Hub status), `GetEventHistory()` (ring buffer), `recordHistory()` for debug page.
+- `backup/crossdrive.go`: `RunAllConfigured()` — runs all enabled apps ignoring schedule filter.
+- `selfupdate/updater.go`: `DryRun()` — checks update availability, compose writability, backup status without performing changes.
+- `monitor/watchdog.go`: `SimulateDisconnect()` / `SimulateReconnect()` with `simulatedPaths` map, `GetDebugStatus()` for per-path probe state. Watchdog `Check()` skips simulated paths.
+- `setup/setup.go`: `NeedsSetup()` now checks `.needs-setup` marker file. `ClearSetupMarker()` for cleanup.
+
+#### Routing changes
+- **Mux carve-out**: `/api/debug/` routes to web server (same pattern as `/api/storage/`), with auth + CSRF.
+- **Removed** `SetDebugDumpDeps()` from `api/router.go` and the `/api/debug/dump` route — dump handler migrated to `handler_debug.go` using Server's existing fields.
+
+#### Infrastructure
+- `setupLogger()` now returns `(*log.Logger, *web.LogBuffer)`. In debug mode, creates `io.MultiWriter(os.Stdout, logBuffer)` so all log output is captured from the start.
+- Debug CSS: ~170 lines of styles for sections, result badges, log viewer, confirm input, danger button, spinner.
+
 ### v0.24.0 — Pre-Testing Observability (2026-02-21)
 
 **Three features for pre-testing diagnostics: verbose debug logging, diagnostic dump endpoint, and startup self-test.**