feat: Add CrowdSec logging, rate limiting, and fix MCP parameter defaults

- Add real client IP detection (CF-Connecting-IP / src fallback) to both frontends
- Add per-IP rate limiting (429) using real IP for Cloudflare compatibility
- Add CrowdSec syslog forwarding with custom log format
- Add httplog option for detailed HTTP logging
- Fix Python-level defaults on MCP tool parameters to match Field(default=X)

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

haproxy_mcp/tools/health.py

@@ -188,7 +188,7 @@ def register_health_tools(mcp):
 
     @mcp.tool()
     def haproxy_get_server_health(
-        backend: Annotated[str, Field(default="", description="Optional: Backend name to filter (e.g., 'pool_1'). Empty = all backends")]
+        backend: Annotated[str, Field(default="", description="Optional: Backend name to filter (e.g., 'pool_1'). Empty = all backends")] = ""
     ) -> str:
         """Get health status of all servers (low-level view). For domain-specific, use haproxy_domain_health."""
         if backend and not validate_backend_name(backend):