feat(storage): support deleting backends and improve admin UI

- Implement storage backend deletion, which automatically resets default storage settings and user-specific overrides when a backend is removed.
- Add unit tests covering the delete action and its cleanup side effects.
- Improve admin UI responsiveness, fixing table scrolling, flex wrapping, and text truncation for long storage backend names.
- Update security documentation to clarify trusted proxy configurations and explain how trusted proxies are protected from automatic bans.

backend/libs/handlers/admin.go

@@ -564,6 +564,10 @@ func (a *App) AdminCreateBan(w http.ResponseWriter, r *http.Request) {
 	if user, ok := a.currentUser(r); ok {
 		createdBy = user.ID
 	}
+	if services.ProtectedBanTarget(r.FormValue("target"), a.cfg.TrustedProxies) {
+		http.Redirect(w, r, "/admin/bans?error="+url.QueryEscape("Refusing to ban loopback or trusted proxy addresses."), http.StatusSeeOther)
+		return
+	}
 	ban, err := a.banService.CreateManualBan(r.FormValue("target"), r.FormValue("reason"), createdBy, expiresAt.UTC())
 	if err != nil {
 		http.Redirect(w, r, "/admin/bans?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
@@ -883,32 +887,45 @@ func (a *App) AdminStartStorageSpeedTest(w http.ResponseWriter, r *http.Request)
 	http.Redirect(w, r, "/admin/storage/"+r.PathValue("backendID")+"/tests?notice="+url.QueryEscape("Storage speed test started in the background."), http.StatusSeeOther)
 }
 
-func (a *App) AdminDisableStorage(w http.ResponseWriter, r *http.Request) {
-	if !a.requireAdmin(w, r) || !a.validateCSRF(w, r) {
-		return
-	}
-	id := r.PathValue("backendID")
-	inUse, _ := a.storageBackendInUse(id)
-	if err := a.uploadService.Storage().DisableBackend(id, inUse); err != nil {
-		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
-		return
-	}
-	a.logger.Info("storage backend disabled", "source", "admin", "severity", "user_activity", "code", 2324, "ip", uploadClientIP(r), "backend_id", id)
-	http.Redirect(w, r, "/admin/storage", http.StatusSeeOther)
-}
-
 func (a *App) AdminDeleteStorage(w http.ResponseWriter, r *http.Request) {
 	if !a.requireAdmin(w, r) || !a.validateCSRF(w, r) {
 		return
 	}
 	id := r.PathValue("backendID")
-	inUse, _ := a.storageBackendInUse(id)
-	if err := a.uploadService.Storage().DeleteBackend(id, inUse); err != nil {
+	cfg, err := a.uploadService.Storage().BackendConfig(id)
+	if err != nil {
 		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
 		return
 	}
+	if cfg.ID == services.StorageBackendLocal {
+		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape("local storage cannot be deleted"), http.StatusSeeOther)
+		return
+	}
+	deletedBoxes, err := a.uploadService.DeleteBoxesForStorageBackend(id, "storage-delete")
+	if err != nil {
+		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
+		return
+	}
+	resetAnonymous, resetUsersDefault, err := a.settingsService.ResetStorageBackend(id)
+	if err != nil {
+		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
+		return
+	}
+	clearedUsers, err := a.authService.ClearStorageBackendOverrides(id)
+	if err != nil {
+		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
+		return
+	}
+	if err := a.uploadService.Storage().DeleteBackend(id, false); err != nil {
+		http.Redirect(w, r, "/admin/storage?error="+url.QueryEscape(err.Error()), http.StatusSeeOther)
+		return
+	}
+	notice := fmt.Sprintf("Storage backend deleted. Removed %d related boxes and cleared %d user overrides.", deletedBoxes, clearedUsers)
+	if resetAnonymous || resetUsersDefault {
+		notice += " Global storage defaults were reset to local."
+	}
 	a.logger.Info("storage backend deleted", "source", "admin", "severity", "user_activity", "code", 2325, "ip", uploadClientIP(r), "backend_id", id)
-	http.Redirect(w, r, "/admin/storage", http.StatusSeeOther)
+	http.Redirect(w, r, "/admin/storage?notice="+url.QueryEscape(notice), http.StatusSeeOther)
 }
 
 func (a *App) AdminRunStorageCleanup(w http.ResponseWriter, r *http.Request) {
@@ -1548,7 +1565,7 @@ func logEntryFromMap(raw map[string]any) adminLogEntry {
 		Method:   logString(raw, "method"),
 		Path:     logString(raw, "path"),
 		Status:   logAnyString(raw["status"]),
-		IP:       firstLogString(raw, "ip", "client_ip", "remote_addr"),
+		IP:       services.IPOnly(firstLogString(raw, "ip", "client_ip", "remote_addr")),
 		UserID:   logString(raw, "user_id"),
 	}
 	entry.Details = logDetails(raw)
@@ -1767,13 +1784,14 @@ func (a *App) storageBackendViews() ([]services.StorageBackendView, error) {
 				usage, _ = concrete.Usage(context.Background())
 			}
 		}
-		inUse, _ := a.storageBackendInUse(cfg.ID)
+		inUse, inUseReason, _ := a.storageBackendUseReason(cfg.ID)
 		speedTests, _ := a.uploadService.Storage().ListSpeedTests(cfg.ID, 25)
 		views = append(views, services.StorageBackendView{
 			Config:       cfg,
 			UsageBytes:   usage,
 			UsageLabel:   services.FormatMegabytesFromBytes(usage),
 			InUse:        inUse,
+			InUseReason:  inUseReason,
 			SpeedTests:   speedTests,
 			CanSpeedTest: cfg.LastTestSuccess,
 		})
@@ -1822,32 +1840,40 @@ func (a *App) adminUserEdit(user services.User, settings services.UploadPolicySe
 }
 
 func (a *App) storageBackendInUse(id string) (bool, error) {
+	inUse, _, err := a.storageBackendUseReason(id)
+	return inUse, err
+}
+
+func (a *App) storageBackendUseReason(id string) (bool, string, error) {
 	settings, err := a.settingsService.UploadPolicy()
 	if err != nil {
-		return false, err
+		return false, "", err
 	}
-	if settings.AnonymousStorageBackend == id || settings.UserStorageBackend == id {
-		return true, nil
+	if settings.AnonymousStorageBackend == id {
+		return true, "selected as the global anonymous storage backend", nil
+	}
+	if settings.UserStorageBackend == id {
+		return true, "selected as the global user storage backend", nil
 	}
 	boxes, err := a.uploadService.ListBoxes(0)
 	if err != nil {
-		return false, err
+		return false, "", err
 	}
 	for _, box := range boxes {
 		if a.uploadService.BoxStorageBackendID(box) == id {
-			return true, nil
+			return true, "used by existing boxes", nil
 		}
 	}
 	users, err := a.authService.ListUsers()
 	if err != nil {
-		return false, err
+		return false, "", err
 	}
 	for _, user := range users {
 		if user.Policy.StorageBackendID != nil && *user.Policy.StorageBackendID == id {
-			return true, nil
+			return true, "assigned to one or more users", nil
 		}
 	}
-	return false, nil
+	return false, "", nil
 }
 
 func floatPtrString(value *float64) string {