移除上下文切换和CPU检测，修复误触发导致无法重启的问题

fix: add missing log function to monitor script

fix(monitor): use /global/event SSE endpoint and fix PID matching

Replace environmentTriggersDeploy with deploymentRestart for faster restarts

feat: integrate Railway API for auto-redeploy on high memory/idle

fix(monitor): use MEMORY_THRESHOLD_MB variable instead of hardcoded value

Change memory threshold from 5000MB to 2000MB

Update get_memory_mb to track all user processes

Remove polling session API, use SSE only for activity detection

fix: filter out SSE heartbeat events to prevent false activity detection

Update README for v4.0 - SSE + polling hybrid monitor

Remove old monitor scripts (v2, v3.1) and test file - using v4.0

Add v4.0 hybrid monitor (SSE + polling) and test script

Fix session parsing to correctly extract all sessions

Add debug logging to check how many sessions API returns