feat(backup): take Tinyforge DB snapshot before every deploy

Adds an opt-in "auto_backup_before_deploy" setting that triggers a
"pre-deploy" backup at the start of every project deploy via the deploy
pipeline (covers both the async HTTP path and the sync poller/webhook
path). Failures are logged to the deploy log but do not abort — missing
a backup is preferable to refusing to ship a fix.

- store: settings.auto_backup_before_deploy column + scan/update wiring
- backup: accept "pre-deploy" as a valid backup_type
- deployer: small PreDeployBackuper interface, hooked into runDeploy
  right after settings load and before any state-mutating work
- api: settings request/response surface the new flag
- web: ToggleSwitch on the backup settings page; "Pre-deploy" badge
  variant in the backup list (badge-warning so it stands out)
- i18n: en/ru strings for the toggle, help text, and badge label

web/src/lib/i18n/en.json

@@ -553,6 +553,9 @@
     "restoreFailed": "Failed to restore backup",
     "typeManual": "Manual",
     "typeAuto": "Auto",
+    "typePreDeploy": "Pre-deploy",
+    "preDeploy": "Backup before every deploy",
+    "preDeployHelp": "Take a Tinyforge DB snapshot at the start of every project deploy. Independent of the periodic schedule above; restorable from this list under the \"Pre-deploy\" type.",
     "save": "Save",
     "saving": "Saving...",
     "saved": "Backup settings saved",

web/src/lib/i18n/ru.json

@@ -553,6 +553,9 @@
     "restoreFailed": "Не удалось восстановить резервную копию",
     "typeManual": "Ручная",
     "typeAuto": "Авто",
+    "typePreDeploy": "Перед деплоем",
+    "preDeploy": "Снимок перед каждым деплоем",
+    "preDeployHelp": "Создавать снимок БД Tinyforge в начале каждого деплоя проекта. Независимо от периодического расписания выше; восстанавливается из списка ниже по типу «Перед деплоем».",
     "save": "Сохранить",
     "saving": "Сохранение...",
     "saved": "Настройки копирования сохранены",

web/src/lib/types.ts

@@ -134,6 +134,7 @@ export interface Settings {
 	backup_enabled: boolean;
 	backup_interval_hours: number;
 	backup_retention_count: number;
+	auto_backup_before_deploy: boolean;
 	stats_interval_seconds: number;
 	stats_retention_hours: number;
 	updated_at: string;