unclecode b97eaeea4c feat(docker): implement smart browser pool with 10x memory efficiency ...

Major refactoring to eliminate memory leaks and enable high-scale crawling:

- **Smart 3-Tier Browser Pool**:
  - Permanent browser (always-ready default config)
  - Hot pool (configs used 3+ times, longer TTL)
  - Cold pool (new/rare configs, short TTL)
  - Auto-promotion: cold → hot after 3 uses
  - 100% pool reuse achieved in tests

- **Container-Aware Memory Detection**:
  - Read cgroup v1/v2 memory limits (not host metrics)
  - Accurate memory pressure detection in Docker
  - Memory-based browser creation blocking

- **Adaptive Janitor**:
  - Dynamic cleanup intervals (10s/30s/60s based on memory)
  - Tiered TTLs: cold 30-300s, hot 120-600s
  - Aggressive cleanup at high memory pressure

- **Unified Pool Usage**:
  - All endpoints now use pool (/html, /screenshot, /pdf, /execute_js, /md, /llm)
  - Fixed config signature mismatch (permanent browser matches endpoints)
  - get_default_browser_config() helper for consistency

- **Configuration**:
  - Reduced idle_ttl: 1800s → 300s (30min → 5min)
  - Fixed port: 11234 → 11235 (match Gunicorn)

**Performance Results** (from stress tests):
- Memory: 10x reduction (500-700MB × N → 270MB permanent)
- Latency: 30-50x faster (<100ms pool hits vs 3-5s startup)
- Reuse: 100% for default config, 60%+ for variants
- Capacity: 100+ concurrent requests (vs ~20 before)
- Leak: 0 MB/cycle (stable across tests)

**Test Infrastructure**:
- 7-phase sequential test suite (tests/)
- Docker stats integration + log analysis
- Pool promotion verification
- Memory leak detection
- Full endpoint coverage

Fixes memory issues reported in production deployments.

2025-10-17 20:38:39 +08:00

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