feat: webhook payload history — store and display recent incoming payloads

Backend:
- WebhookPayloadLog model (provider_id, method, headers, body, status, extracted_fields, error_message)
- Auto-log payloads in generic_webhook() with matched/unmatched/error status
- Auto-prune beyond max_stored_payloads per provider
- Header filtering (only Content-Type, User-Agent, X-* stored; no Authorization)
- GET/DELETE /api/providers/{id}/webhook-logs endpoints
- store_payloads + max_stored_payloads in WebhookProviderConfig

Frontend:
- WebhookPayloadHistory.svelte — expandable log viewer with status badges, JSON body, headers, extracted fields
- payloadHistory flag on webhook provider descriptor
- max_stored_payloads config field (0 = disabled)
- Password confirmation field on change password modal
- i18n keys for webhook logs (en + ru)

packages/server/src/notify_bridge_server/main.py

@@ -43,6 +43,7 @@ from .api.action_rules import router as action_rules_router
 from .api.action_types import router as action_types_router
 from .commands.webhook import router as webhook_router, set_webhook_secret
 from .api.webhooks import router as webhooks_router
+from .api.webhook_logs import router as webhook_logs_router
 
 
 @asynccontextmanager
@@ -141,6 +142,7 @@ app.include_router(command_trackers_router)
 app.include_router(command_template_configs_router)
 app.include_router(webhook_router)
 app.include_router(webhooks_router)
+app.include_router(webhook_logs_router)
 
 
 @app.get("/api/health")