feat(10-02): integrate ProxyPool into ZhihuCrawler

- Add proxy_pool parameter to ZhihuCrawler constructor
- Add _current_proxy tracking for health check feedback
- Implement _parse_proxy_url static method for URL parsing
- Implement _on_request_success/failure for proxy health feedback
- Prioritize proxy_pool over config.proxy for multi-proxy support
- Maintain backward compatibility with single proxy config

Tests:
- test_crawler_accepts_proxy_pool
- test_crawler_without_proxy_pool (backward compatibility)
- test_parse_proxy_url (HTTP, auth, SOCKS5)
- test_proxy_pool_takes_priority_over_config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_crawler/test_proxy_pool.py

@@ -6,12 +6,14 @@ Tests cover:
 - Round-robin proxy rotation
 - Empty pool handling
 - Single proxy handling
+- Health check and cooldown recovery
+- ZhihuCrawler integration with ProxyPool
 """
 
 import os
 import pytest
 from pathlib import Path
-from unittest.mock import patch
+from unittest.mock import patch, MagicMock
 
 # Import will fail until proxy_pool module is implemented (RED phase)
 from kb_workflow.crawler.proxy_pool import ProxyPool, ProxyEntry, ProxyPoolConfig
@@ -304,3 +306,70 @@ class TestProxyPoolHealthCheck:
             pool._entries[1].record_failure(max_fail_count=3)
 
         assert pool.get_available_count() == 1
+
+
+class TestZhihuCrawlerProxyPoolIntegration:
+    """Tests for ZhihuCrawler integration with ProxyPool."""
+
+    def test_crawler_accepts_proxy_pool(self):
+        """Test that ZhihuCrawler accepts proxy_pool parameter."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+
+        config = ProxyPoolConfig(
+            proxies=["http://proxy-a:8080", "http://proxy-b:8080"]
+        )
+        pool = ProxyPool(config)
+
+        crawler = ZhihuCrawler(proxy_pool=pool)
+
+        assert crawler.proxy_pool is pool
+        assert crawler.proxy_pool.has_proxies()
+
+    def test_crawler_without_proxy_pool(self):
+        """Test that ZhihuCrawler works without proxy_pool (backward compatibility)."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+
+        crawler = ZhihuCrawler()
+
+        assert crawler.proxy_pool is None
+
+    def test_parse_proxy_url(self):
+        """Test _parse_proxy_url static method."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+
+        # Test HTTP proxy without auth
+        result = ZhihuCrawler._parse_proxy_url("http://127.0.0.1:7890")
+        assert result == {"server": "http://127.0.0.1:7890"}
+
+        # Test HTTP proxy with auth
+        result = ZhihuCrawler._parse_proxy_url("http://user:pass@proxy.example.com:8080")
+        assert result == {
+            "server": "http://proxy.example.com:8080",
+            "username": "user",
+            "password": "pass"
+        }
+
+        # Test SOCKS5 proxy
+        result = ZhihuCrawler._parse_proxy_url("socks5://127.0.0.1:1080")
+        assert result == {"server": "socks5://127.0.0.1:1080"}
+
+    def test_proxy_pool_takes_priority_over_config(self):
+        """Test that proxy_pool takes priority over config.proxy."""
+        from kb_workflow.crawler.zhihu_crawler import ZhihuCrawler
+        from kb_workflow.crawler.config import CrawlerConfig, ProxyConfig
+
+        # Create config with single proxy
+        single_proxy_config = CrawlerConfig(
+            proxy=ProxyConfig(server="http://config-proxy:9999")
+        )
+
+        # Create proxy pool with different proxies
+        pool = ProxyPool(ProxyPoolConfig(
+            proxies=["http://pool-proxy:8080"]
+        ))
+
+        crawler = ZhihuCrawler(config=single_proxy_config, proxy_pool=pool)
+
+        # Verify proxy_pool is set
+        assert crawler.proxy_pool is pool
+        assert crawler.config.proxy is not None