docs: Update CLAUDE.md with new features

- Update tool count: 21 → 22
- Add haproxy_wait_drain to server management tools
- Update haproxy_add_server: slot=0 for auto-select
- Update server.py description (~1750 lines, 22 tools)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -241,7 +241,7 @@ Returns backend server status for a specific domain:
 
 **Status values:** `healthy` (all UP), `degraded` (partial UP), `down` (all DOWN), `no_servers`
 
-## MCP Tools (21 total)
+## MCP Tools (22 total)
 
 ### Domain Management
 | Tool | Description |
@@ -254,12 +254,13 @@ Returns backend server status for a specific domain:
 | Tool | Description |
 |------|-------------|
 | `haproxy_list_servers` | List servers for a domain |
-| `haproxy_add_server` | Add server to slot (1-10), auto-saved |
+| `haproxy_add_server` | Add server to slot (1-10 or 0=auto), auto-saved |
 | `haproxy_add_servers` | Bulk add servers (JSON array), auto-saved |
 | `haproxy_remove_server` | Remove server from slot, auto-saved |
 | `haproxy_set_server_state` | Set state: ready/drain/maint |
 | `haproxy_set_server_weight` | Set weight (0-256) |
 | `haproxy_set_domain_state` | Set all servers of domain to ready/drain/maint |
+| `haproxy_wait_drain` | Wait for connections to drain (timeout configurable) |
 
 ### Health Check
 | Tool | Description |
@@ -337,7 +338,7 @@ echo "set server pool_1/pool_1_1 state ready" | nc localhost 9999
 ```
 /opt/haproxy/
 ├── mcp/                 # MCP server (streamable-http)
-│   └── server.py        # Main MCP server (~1600 lines, 21 tools)
+│   └── server.py        # Main MCP server (~1750 lines, 22 tools)
 ├── conf/
 │   ├── haproxy.cfg      # Main HAProxy config (100 pool backends)
 │   ├── domains.map      # Domain → Pool mapping