docs: add workflow examples

examples/proxy-backed-crawling/README.md

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+# Proxy-Backed Crawling
+
+Use proxy rotation when you need to distribute a crawl across a proxy pool. webclaw supports a single proxy or a proxy file.
+
+## Single Proxy
+
+```bash
+webclaw https://example.com \
+  --proxy http://user:pass@proxy.example.com:8080 \
+  --format markdown
+```
+
+SOCKS5 is supported too:
+
+```bash
+webclaw https://example.com \
+  --proxy socks5://proxy.example.com:1080 \
+  --format markdown
+```
+
+## Proxy Pool
+
+Create `proxies.txt` with one proxy per line:
+
+```text
+http://user:pass@proxy-1.example.com:8080
+http://user:pass@proxy-2.example.com:8080
+http://user:pass@proxy-3.example.com:8080
+```
+
+Run a crawl with controlled concurrency:
+
+```bash
+webclaw https://docs.example.com \
+  --crawl \
+  --depth 2 \
+  --max-pages 100 \
+  --concurrency 10 \
+  --delay 200 \
+  --proxy-file proxies.txt \
+  --format markdown
+```
+
+## Batch URLs
+
+```bash
+webclaw --urls-file urls.txt \
+  --proxy-file proxies.txt \
+  --concurrency 10 \
+  --format json
+```
+
+Proxy rotation helps with throughput and IP reputation. It does not replace request fingerprinting, JS rendering, or challenge handling for heavily protected sites. For those, use hosted cloud mode with `WEBCLAW_API_KEY`.