Add live Windows Gaming PC stats with metric bars

- New API /api/windows/stats: SSHes into gamingpc, runs PowerShell for CPU/RAM/Disk/Uptime
- Live metric bars on the Windows PC card (CPU/RAM/C:) updating every 30s
- Duplicate barColor() removed

serve.py

@@ -241,6 +241,49 @@ async def docker_stats():
         return {"error": str(e)[:200], "containers": []}
 
 
+@app.get("/api/windows/stats")
+async def windows_stats():
+    """Get live stats from Windows Gaming PC via PowerShell over SSH."""
+    import subprocess, base64, json as _json
+    
+    # PowerShell script: backslash counter paths need single \, Python raw string preserves them
+    ps_script = r'''
+$cpu=(Get-Counter '\Processor(_Total)\% Processor Time').CounterSamples[0].CookedValue
+$os=Get-CimInstance Win32_OperatingSystem
+$disk=Get-CimInstance Win32_LogicalDisk -Filter "DeviceID='C:'"
+$uptime=(Get-Date)-$os.LastBootUpTime
+@{
+    'cpu'=[math]::Round($cpu,1)
+    'mem_total_gb'=[math]::Round($os.TotalVisibleMemorySize/1MB,1)
+    'mem_free_gb'=[math]::Round($os.FreePhysicalMemory/1MB,1)
+    'disk_c_total_gb'=[math]::Round($disk.Size/1GB,1)
+    'disk_c_free_gb'=[math]::Round($disk.FreeSpace/1GB,1)
+    'uptime_days'=[math]::Round($uptime.TotalDays,1)
+} | ConvertTo-Json
+'''.strip()
+    
+    try:
+        encoded = base64.b64encode(ps_script.encode('utf-16le')).decode()
+        result = subprocess.run(
+            ["ssh", "gamingpc",
+             "powershell", "-NoProfile", "-EncodedCommand", encoded],
+            capture_output=True, text=True, timeout=30
+        )
+        if result.returncode != 0:
+            return {"error": result.stderr.strip()[:300], "online": False}
+        
+        # Filter CLIXML noise from stdout
+        clean = "\n".join(l for l in result.stdout.split("\n")
+                         if l.strip() and not l.startswith("#<") and not l.startswith("<"))
+        data = _json.loads(clean)
+        data["online"] = True
+        data["mem_used_gb"] = round(data["mem_total_gb"] - data["mem_free_gb"], 1)
+        data["disk_c_used_gb"] = round(data["disk_c_total_gb"] - data["disk_c_free_gb"], 1)
+        return data
+    except Exception as e:
+        return {"error": str(e)[:300], "online": False}
+
+
 @app.get("/{path:path}")
 async def index(path: str = ""):
     """Serve static files, fallback to index.html."""