MQTT-based live CPU/RAM metrics + remove auth from HA control

- Enrich server data with MQTT system topics (cpu_usage_percent,
  ram_usage_percent, temp, model etc.) published by Unraid MQTT Agent
- Works for both Daddelolymp and Adriahub topics
- MQTT overlay runs on every request (even cached) for fresh metrics
- Remove JWT auth from /api/ha/control — local dashboard doesn't need it
- Add cpu brand field to GraphQL query

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

server/routers/servers.py

@@ -9,6 +9,7 @@ from fastapi import APIRouter
 
 from server.cache import cache
 from server.config import get_settings
+from server.services.mqtt_service import mqtt_service
 from server.services.unraid_service import ServerConfig, fetch_all_servers
 
 logger = logging.getLogger(__name__)
@@ -18,6 +19,93 @@ router = APIRouter(prefix="/api", tags=["servers"])
 CACHE_KEY = "servers"
 
 
+# ---------------------------------------------------------------------------
+# MQTT enrichment — overlay live system metrics from MQTT topics
+# ---------------------------------------------------------------------------
+
+def _enrich_from_mqtt(servers: List[Dict[str, Any]]) -> None:
+    """Merge live CPU/RAM data from MQTT ``<prefix>/system`` topics.
+
+    The Unraid MQTT Agent plugin publishes JSON payloads to topics like
+    ``unraid-daddelolymp/system`` or ``Adriahub/system`` every ~15 s.
+    These contain live ``cpu_usage_percent``, ``ram_usage_percent``, etc.
+    that the GraphQL API does not expose.
+    """
+
+    store = mqtt_service.store
+
+    for srv in servers:
+        name = srv.get("name", "")
+        if not name:
+            continue
+
+        # Try common topic patterns
+        system_data: Dict[str, Any] | None = None
+        for pattern in (
+            f"{name}/system",                          # "Adriahub/system"
+            f"unraid-{name.lower()}/system",           # "unraid-daddelolymp/system"
+            f"unraid-{name}/system",                   # "unraid-Daddelolymp/system"
+        ):
+            msg = store.get(pattern)
+            if msg is not None and isinstance(msg.payload, dict):
+                system_data = msg.payload
+                break
+
+        if not system_data:
+            continue
+
+        # --- CPU ---
+        cpu_pct = system_data.get("cpu_usage_percent")
+        if cpu_pct is not None:
+            srv["cpu"]["usage_pct"] = round(float(cpu_pct), 1)
+
+        cpu_model = system_data.get("cpu_model")
+        if cpu_model:
+            srv["cpu"]["brand"] = cpu_model
+
+        cpu_temp = system_data.get("cpu_temp_celsius")
+        if cpu_temp is not None:
+            srv["cpu"]["temp_c"] = cpu_temp
+
+        cores = system_data.get("cpu_cores")
+        if cores:
+            srv["cpu"]["cores"] = cores
+
+        threads = system_data.get("cpu_threads")
+        if threads:
+            srv["cpu"]["threads"] = threads
+
+        # --- RAM ---
+        ram_pct = system_data.get("ram_usage_percent")
+        if ram_pct is not None:
+            srv["ram"]["pct"] = round(float(ram_pct), 1)
+
+        ram_total = system_data.get("ram_total_bytes")
+        if ram_total:
+            srv["ram"]["total_gb"] = round(ram_total / (1024 ** 3), 1)
+
+        ram_used = system_data.get("ram_used_bytes")
+        if ram_used:
+            srv["ram"]["used_gb"] = round(ram_used / (1024 ** 3), 1)
+
+        # --- Uptime ---
+        uptime_secs = system_data.get("uptime_seconds")
+        if uptime_secs:
+            days = uptime_secs // 86400
+            hours = (uptime_secs % 86400) // 3600
+            srv["uptime"] = f"{days}d {hours}h"
+
+        srv["online"] = True
+
+        logger.debug(
+            "[UNRAID] %s: MQTT enriched — CPU %.1f%% %.0f°C, RAM %.1f%%",
+            name,
+            srv["cpu"].get("usage_pct", 0),
+            srv["cpu"].get("temp_c", 0) or 0,
+            srv["ram"].get("pct", 0),
+        )
+
+
 @router.get("/servers")
 async def get_servers() -> Dict[str, Any]:
     """Return status information for all configured Unraid servers.
@@ -32,6 +120,8 @@ async def get_servers() -> Dict[str, Any]:
     # --- cache hit? -----------------------------------------------------------
     cached = await cache.get(CACHE_KEY)
     if cached is not None:
+        # Always overlay fresh MQTT data even on cache hits
+        _enrich_from_mqtt(cached.get("servers", []))
         return cached
 
     # --- cache miss -----------------------------------------------------------
@@ -56,6 +146,9 @@ async def get_servers() -> Dict[str, Any]:
             "message": str(exc),
         }
 
+    # Overlay live MQTT system metrics
+    _enrich_from_mqtt(servers_data)
+
     payload: Dict[str, Any] = {
         "servers": servers_data,
     }