feat: expand collector logging and improve log viewer UX

Add env-gated lifecycle instrumentation and retention controls in collector, plus app log paging index migration. Update dashboard log viewer with shift-range/double-click selection, latest-jump behavior, clear-all integration, and copy feedback in setup guide.

Author: leolionart

.env.example

@@ -7,8 +7,20 @@ DB_PASSWORD=your_secure_password_here
 CLIPROXY_URL=http://host.docker.internal:8317
 CLIPROXY_MANAGEMENT_KEY=your-management-secret-key
 
-# Collection Settings
-COLLECTOR_INTERVAL_SECONDS=300
+# Collector intervals (seconds/minutes)
+COLLECTOR_INTERVAL_SECONDS=60
+CREDENTIAL_SYNC_INTERVAL_SECONDS=60
+APP_LOG_CLEANUP_INTERVAL_MINUTES=30
+APP_LOG_RETENTION_DAYS=30
+
+# Log verbosity control
+LOG_VERBOSITY=normal
+LOG_DEBUG_EVENTS=false
+LOG_DEBUG_EVENTS_MAX_PER_SYNC=200
 
 # Timezone offset from UTC (default: 7 for Vietnam)
 TIMEZONE_OFFSET_HOURS=7
+
+# Frontend polling interval (seconds)
+VITE_AUTO_REFRESH_SECONDS=60
+VITE_APP_LOGS_PAGE_SIZE=500