docs(08-03): complete anti-crawl measures plan

- Proxy configuration from HTTP_PROXY/HTTPS_PROXY
- Random delay (1-3s) between requests
- Exponential backoff retry (3 attempts)
- x-zse-96 signature handled by browser

All 44 crawler tests passing

Requirements: NET-01, NET-02, NET-03 completed

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

.planning/REQUIREMENTS.md

@@ -23,9 +23,9 @@
 
 ### 网络与反爬
 
-- [ ] **NET-01**: 支持代理 IP 配置
-- [ ] **NET-02**: 请求频率控制，避免触发反爬
-- [ ] **NET-03**: 自动获取请求签名（x-zse-96），无需手动逆向
+- [x] **NET-01**: 支持代理 IP 配置
+- [x] **NET-02**: 请求频率控制，避免触发反爬
+- [x] **NET-03**: 自动获取请求签名（x-zse-96），无需手动逆向
 
 ### Pipeline 整合
 
@@ -119,9 +119,9 @@
 | CONT-02 | Phase 8 | Complete |
 | CONT-03 | Phase 8 | Complete |
 | CONT-04 | Phase 8 | Complete |
-| NET-01 | Phase 8 | Pending |
-| NET-02 | Phase 8 | Pending |
-| NET-03 | Phase 8 | Pending |
+| NET-01 | Phase 8 | Complete |
+| NET-02 | Phase 8 | Complete |
+| NET-03 | Phase 8 | Complete |
 | PIPE-01 | Phase 9 | Pending |
 | PIPE-02 | Phase 9 | Pending |
 | PIPE-03 | Phase 9 | Pending |

.planning/phases/08-crawler/08-03-SUMMARY.md

@@ -0,0 +1,88 @@
+---
+phase: 08-crawler
+plan: 03
+subsystem: crawler
+tags: [proxy, rate-limiter, retry, anti-crawl, playwright]
+
+requires:
+  - phase: 08-01
+    provides: ZhihuCrawler base class
+provides:
+  - CrawlerConfig for proxy/rate limiting configuration
+  - Random delay (1-3s) between requests
+  - Exponential backoff retry (3 attempts)
+  - Automatic x-zse-96 signature handling via browser
+
+tech-stack:
+  added:
+    - tenacity (retry library)
+  patterns:
+    - Environment variable proxy configuration
+    - Exponential backoff retry pattern
+    - Random delay for rate limiting
+
+key-files:
+  created:
+    - kb_workflow/crawler/config.py
+    - tests/test_crawler/test_proxy_config.py
+    - tests/test_crawler/test_rate_limiter.py
+    - tests/test_crawler/test_api_intercept.py
+  modified:
+    - kb_workflow/crawler/zhihu_crawler.py
+    - kb_workflow/crawler/models.py
+    - tests/test_crawler/test_comment_crawler.py
+key-decisions:
+  - Mandatory proxy configuration (configurable via proxy_required flag)
+  - Use tenacity library for retry with exponential backoff
+  - x-zse-96 signature handled automatically by browser via route.fetch()
+  - Random delay range: 1-3 seconds (configurable)
+requirements-completed: [NET-01, NET-02, NET-03]
+duration: 15min
+completed: 2026-03-17
+---
+
+## Summary
+
+实现了网络反爬措施：强制代理配置、请求频率控制、有限重试机制，以及利用浏览器自动处理 x-zse-96 签名。
+
+### What Was Built
+
+**CrawlerConfig 类** (`kb_workflow/crawler/config.py`)
+- `ProxyConfig` - 代理配置模型
+- 从环境变量 `HTTP_PROXY`/`HTTPS_PROXY` 读取代理设置
+- `proxy_required` 标志控制是否强制代理（默认 `True`）
+- 随机延迟配置（`min_delay`, `max_delay`）
+- 重试配置（`max_retries`, `retry_min_wait`, `retry_max_wait`）
+
+**ZhihuCrawler 增强**
+- `_start_browser_with_proxy()` - 启动浏览器并应用代理配置
+- `_apply_random_delay()` - 应用随机延迟（1-3 秒）
+- `_crawl_with_retry()` - 带指数退避的重试逻辑
+- 浏览器自动处理 x-zse-96 签名（通过 `route.fetch()`）
+
+### Test Coverage
+
+**44 个测试全部通过**
+- `test_proxy_config.py` - 11 个代理配置测试
+- `test_rate_limiter.py` - 8 个频率控制测试
+- `test_api_intercept.py` - 4 个 API 拦截测试
+- 其他测试文件保持通过
+
+### Commits
+
+1. `626fb73` feat(08-03): create CrawlerConfig for proxy and rate limiting
+2. `9e1452d` feat(08-03): integrate proxy, delay, and retry into ZhihuCrawler
+
+### Key Decisions
+
+1. **强制代理**: 默认 `proxy_required=True`，未配置代理时抛出 `ValueError`
+2. **重试机制**: 使用 `tenacity` 库，最多 3 次重试，间隔指数递增（2s → 10s）
+3. **签名处理**: 利用浏览器 `route.fetch()` 自动携带 x-zse-96 签名，无需手动逆向
+
+### Requirements Completed
+
+- **NET-01**: 用户可以通过环境变量配置代理 IP ✓
+- **NET-02**: 不配置代理时，爬虫拒绝运行并提示错误 ✓
+- **NET-03**: 每次请求间有随机延迟（1-3秒），失败重试 3 次 ✓
+
+## Self-Check: PASSED