feat: production readiness — security, perf, bug fixes, bridge self-monitoring

Comprehensive multi-area pass driven by a parallel 8-agent production
review. Frontend, backend, database, security, performance, operational,
plus a new self-monitoring feature.

## Critical fixes
- Planka webhook: reads bounded raw body (was NameError on every call)
- HA quiet hours: ha_state_changed/automation_triggered/service_called/
  event_fired added to deferrable set (were silently dropped)
- DNS-rebinding SSRF: PinnedResolver wired into shared aiohttp session
- Telegram inbound webhook: secret now mandatory (401 without)
- Generic webhook: auth_mode="none" requires explicit
  acknowledge_unauthenticated=true; per-IP rate limit 60/min
- svelte-check: 5 null-narrowing errors in EventDetailModal fixed
- Provider hardcoding: Immich-only block extracted to descriptor
  featureDiscoveryHint
- command_sync: snapshot+expunge bot before exiting AsyncSession

## Bug fixes
- notifier asyncio.gather(return_exceptions=True) — one bad chat no longer
  cancels peer sends
- NotificationDispatcher hoisted out of per-tracker loop
- Provider credential resolution unified across all 5 dispatch sites
- HA asyncio.shield now drains inner task on cancellation
- Provider construction switched from if/elif ladder to factory registry
- NUT first poll seeds silently (no spurious ups_on_battery)
- Quiet-hours gate: event-type-disabled now wins over deferral
- APScheduler drain job ID resolution upgraded to seconds
- HA on_status_change wired through to EventLog
- Webhook payload rollback failures now logged (not swallowed)
- Batched receivers/chats/bots in load_link_data (was per-target N+1)
- flag_modified on JSON column reassignments in deferred_dispatch

## Database
- UNIQUE indexes on service_provider.webhook_token,
  telegram_bot.webhook_path_id, partial UNIQUE on telegram_bot.bot_id,
  telegram_chat(bot_id, chat_id), notification_tracker_target unique link,
  partial UNIQUE on bridge_self provider per user
- Composite ix_event_log_user_event_type_created index
- save_chat_from_webhook switched to ON CONFLICT DO UPDATE
- ondelete=CASCADE on user-id FKs (model annotation; app-side cascade
  delete added for existing data)
- delete_notification_tracker converted from N+1 to bulk DELETE/UPDATE
- Module-level asyncio.Lock replaced with lazy _get_lock() pattern
- VACUUM INTO snapshot now PRAGMA integrity_check verified

## Performance
- Jinja2 template compilation LRU cached (lru_cache maxsize=512)
- Per-locale render cache in NotificationDispatcher (skips re-rendering
  identical content for receivers sharing a locale)
- Tracker list cached per provider_id with 5s TTL + explicit invalidation
  on tracker CRUD (relieves HA chat-bus rate query pressure)
- Nav-counts collapsed from 16 round-trips to single UNION ALL
- HA event_log: skip persisting empty assets_added/removed events

## Security hardening
- Mass-assignment guard on Action create/update; cron sub-minute reject
- Backup JSON depth/node-count cap (depth ≤ 10, nodes ≤ 100k)
- _sanitize_config extended to all JSON-typed fields on backup import
- Telegram _safe_get walks redirects manually with SSRF revalidation
- Bcrypt 72-byte password length cap with clear 422
- Webhook payload body redaction; sensitive substring set extended with
  oauth/client_secret/webhook_secret/csrf in both header filter and
  template extras filter

## Frontend
- 76 catch (err: any) sites converted to errMsg(err) helper
- globalProviderFilter: pure getter; reconciliation moved to one-time
  $effect in +layout
- Provider-filter binding: removed paired $effects + _syncingFilter flag,
  now one-way derived
- entity-cache: separate _refreshing flag for background re-fetches
- api.ts 401 handling: AuthRedirectError class + dedup _redirecting flag,
  goto() instead of window.location.href
- a11y: aria-expanded on mobile More, role=switch + aria-checked on
  Telegram bot toggles

## Tests & operations
- CI pytest gate added to .gitea/workflows/build.yml + release.yml
  (wheel-built install to dodge editable-install slowness)
- /api/ready upgraded to deep healthcheck (db SELECT 1, scheduler.running,
  HA supervisor presence) returning {ready, checks, errors, version}
- /api/metrics endpoint with prometheus_client (deferred_pending,
  event_log_total, dispatch_duration, poll_failures, send_failures)
- New OPERATIONS.md covering deploy, healthchecks, metrics, backup/restore
  procedures, log handling, common scenarios, upgrade flow
- New tests: test_bridge_self (11), test_gitea_parser (9),
  test_planka_parser (6), test_immich_change_detector (6),
  test_backup_roundtrip (1)

## New feature: bridge self-monitoring
- New bridge_self provider type — internal sink for bridge health events
- Three event types: bridge_self_poll_failures (consecutive tracker poll
  failures), bridge_self_deferred_backlog (pending count crosses
  threshold), bridge_self_target_failures (consecutive 5xx/network
  failures per target)
- Per-user thresholds (defaults: 3 / 100 / 5) configurable via the
  provider config form
- Auto-seeded on user create + /setup + boot backfill for existing users
- Anti-spam: counters reset after emission; backlog uses transition latch
- Self-loop guard: bridge_self failures don't count toward target-failure
  thresholds (logged only) — wire to your own Telegram/Email/Matrix to
  get notified when polls/dispatches/sends fail
- 6 default templates (3 events × 2 locales), tracking config columns
  with backfill migration, frontend descriptor (excluded from "create
  provider" wizard since auto-managed)

Operator-visible behavior changes (call out in release notes):
- NOTIFY_BRIDGE_TELEGRAM_WEBHOOK_SECRET now REQUIRED for webhook mode
- Existing webhook providers with auth_mode="none" need explicit opt-in
- Generic webhook endpoint rate-limited 60/min per source IP
- HA disconnect/reconnect writes ha_status_* EventLog rows
- Every user gets a bridge_self provider — wire it to a target to
  receive failure alerts

Pre-existing test failures (test_ssrf, test_release_provider) on
Python 3.13 are unrelated; CI runs on 3.12.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/routes/settings/backup/+page.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import { api, fetchAuth } from '$lib/api';
+	import { api, fetchAuth , errMsg} from '$lib/api';
 	import { t } from '$lib/i18n';
 	import Loading from '$lib/components/Loading.svelte';
 	import MdiIcon from '$lib/components/MdiIcon.svelte';
@@ -97,9 +97,10 @@
 			scheduledSettings = settings;
 			backupFiles = files;
 			pending = p;
-		} catch (err: any) {
-			error = err.message;
-			snackError(err.message);
+		} catch (err: unknown) {
+			const m = errMsg(err);
+			error = m;
+			snackError(m);
 		} finally {
 			loaded = true;
 		}
@@ -110,7 +111,7 @@
 			await api('/backup/pending-restore', { method: 'DELETE' });
 			snackSuccess(t('backup.pendingCancelled'));
 			pending = null;
-		} catch (err: any) { snackError(err.message); }
+		} catch (err: unknown) { snackError(errMsg(err)); }
 	}
 
 	async function applyAndRestart(): Promise<void> {
@@ -131,9 +132,9 @@
 				if (attempts < 120) setTimeout(poll, 1000);
 			};
 			setTimeout(poll, 1500);
-		} catch (err: any) {
+		} catch (err: unknown) {
 			restartingOverlay = false;
-			snackError(err.message);
+			snackError(errMsg(err));
 		}
 	}
 
@@ -144,8 +145,8 @@
 			await api(`/backup/files?secrets_mode=${mode}`, { method: 'POST' });
 			snackSuccess(t('backup.manualCreated'));
 			await refreshFiles();
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		} finally {
 			creatingBackup = false;
 		}
@@ -178,8 +179,8 @@
 			a.click();
 			URL.revokeObjectURL(url);
 			snackSuccess(t('backup.exportSuccess'));
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		} finally {
 			exporting = false;
 		}
@@ -202,8 +203,8 @@
 			formData.append('file', importFile);
 			const res = await fetchAuth('/backup/validate', { method: 'POST', body: formData });
 			validationResult = await res.json();
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		} finally {
 			validating = false;
 		}
@@ -230,8 +231,8 @@
 			snackSuccess(t('backup.restorePrepared'));
 			postRestoreModalOpen = true;
 			importFile = null;
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		} finally {
 			importing = false;
 		}
@@ -246,8 +247,8 @@
 				body: JSON.stringify(scheduledSettings),
 			});
 			snackSuccess(t('backup.scheduleSaved'));
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		} finally {
 			savingSchedule = false;
 		}
@@ -258,8 +259,8 @@
 		loadingFiles = true;
 		try {
 			backupFiles = await api<BackupFile[]>('/backup/files');
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		} finally {
 			loadingFiles = false;
 		}
@@ -275,8 +276,8 @@
 			a.download = filename;
 			a.click();
 			URL.revokeObjectURL(url);
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		}
 	}
 
@@ -286,8 +287,8 @@
 			snackSuccess(t('backup.fileDeleted'));
 			confirmDeleteFile = '';
 			await refreshFiles();
-		} catch (err: any) {
-			snackError(err.message);
+		} catch (err: unknown) {
+			snackError(errMsg(err));
 		}
 	}
 </script>