feat: add trust proxy support for correct IP logging behind reverse proxies (v2.7.6)

- Add TRUST_PROXY environment variable to enable proxy header trust
- Configure Express trust proxy in both HTTP server implementations
- Fix issue #19: Docker internal IPs logged instead of real client IPs
- Update documentation with reverse proxy configuration guide
- Add examples for nginx proxy header forwarding
- Maintain backward compatibility (disabled by default)

When TRUST_PROXY=1 is set, the server will correctly log client IPs
from X-Forwarded-For headers instead of proxy/container IPs.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/http-server.ts

@@ -95,6 +95,13 @@ export async function startFixedHTTPServer() {
   
   const app = express();
   
+  // Configure trust proxy for correct IP logging behind reverse proxies
+  const trustProxy = process.env.TRUST_PROXY ? Number(process.env.TRUST_PROXY) : 0;
+  if (trustProxy > 0) {
+    app.set('trust proxy', trustProxy);
+    logger.info(`Trust proxy enabled with ${trustProxy} hop(s)`);
+  }
+  
   // CRITICAL: Don't use any body parser - StreamableHTTPServerTransport needs raw stream
   
   // Security headers