feat: add PC monitoring tab with Windows agent

- New /api/pc endpoints (heartbeat, list, delete)
- Dashboard tabs: Серверы / ПК with auto-refresh
- PowerShell agent: CPU, RAM, Disk, Network, GPU, Top processes
- One-command Windows installer with Scheduled Task
- PC setup instructions modal

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

server/api/pc.py

@@ -0,0 +1,95 @@
+import json
+from datetime import datetime
+from typing import Dict
+
+from fastapi import APIRouter, Request, Depends
+
+from server.auth import require_auth
+from server.config import DATA_DIR
+
+router = APIRouter(prefix="/api/pc", tags=["pc"])
+
+# In-memory PC metrics cache
+pc_metrics: Dict[str, dict] = {}
+
+PC_FILE = DATA_DIR / "pc_agents.json"
+
+
+def _load_pc_data():
+    if PC_FILE.exists():
+        with open(PC_FILE) as f:
+            return json.load(f)
+    return {}
+
+
+def _save_pc_data(data):
+    with open(PC_FILE, "w") as f:
+        json.dump(data, f, indent=2, ensure_ascii=False)
+
+
+@router.post("/heartbeat")
+async def pc_heartbeat(request: Request):
+    """Receive metrics from Windows PC agent. No auth required (agent sends by name)."""
+    body = await request.json()
+    agent_name = body.get("agent_name", "")
+    if not agent_name:
+        return {"status": "error", "detail": "agent_name required"}
+
+    metrics = body.get("metrics", {})
+    timestamp = body.get("timestamp", datetime.now().isoformat())
+
+    entry = {
+        "agent_name": agent_name,
+        "metrics": metrics,
+        "timestamp": timestamp,
+        "ip": request.client.host if request.client else "",
+        "online": True,
+        "last_seen": datetime.now().isoformat(),
+    }
+
+    pc_metrics[agent_name] = entry
+
+    # Persist
+    stored = _load_pc_data()
+    stored[agent_name] = entry
+    _save_pc_data(stored)
+
+    return {"status": "ok"}
+
+
+@router.get("/list")
+async def pc_list(request: Request, user: str = Depends(require_auth)):
+    """List all PC agents with metrics."""
+    stored = _load_pc_data()
+
+    # Merge with in-memory (fresher)
+    for name, data in pc_metrics.items():
+        stored[name] = data
+
+    # Mark stale agents (no heartbeat > 3 min)
+    now = datetime.now()
+    result = []
+    for name, data in stored.items():
+        last_seen = data.get("last_seen", "")
+        try:
+            last_dt = datetime.fromisoformat(last_seen)
+            stale = (now - last_dt).total_seconds() > 180
+        except Exception:
+            stale = True
+
+        data["online"] = not stale
+        result.append(data)
+
+    return result
+
+
+@router.delete("/{agent_name}")
+async def pc_delete(agent_name: str, request: Request, user: str = Depends(require_auth)):
+    """Remove a PC agent."""
+    pc_metrics.pop(agent_name, None)
+
+    stored = _load_pc_data()
+    stored.pop(agent_name, None)
+    _save_pc_data(stored)
+
+    return {"status": "ok"}