feat: initial VPS monitoring platform

- FastAPI backend with auth, server CRUD, metrics collection
- Web dashboard with dark theme, server cards, SSH terminal (xterm.js)
- Telegram bot with inline keyboards, server management, reboot
- Telegram Mini App for mobile monitoring
- Background monitoring via asyncssh (CPU, RAM, Disk, Network, Uptime)
- Alert system with configurable thresholds
- WebSocket SSH terminal in browser
- One-command install script
- Systemd service configuration

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

server/auth.py

@@ -0,0 +1,43 @@
+from datetime import datetime, timedelta
+from jose import jwt
+from passlib.context import CryptContext
+from fastapi import Request, HTTPException
+from fastapi.responses import RedirectResponse
+from server.config import load_settings
+
+SECRET_KEY = "vps-monitoring-secret-key-change-me-in-production"
+ALGORITHM = "HS256"
+TOKEN_EXPIRE_HOURS = 24
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return plain_password == hashed_password
+
+
+def create_token(username: str) -> str:
+    expire = datetime.utcnow() + timedelta(hours=TOKEN_EXPIRE_HOURS)
+    return jwt.encode({"sub": username, "exp": expire}, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def verify_token(token: str) -> str | None:
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        return payload.get("sub")
+    except Exception:
+        return None
+
+
+def get_current_user(request: Request) -> str | None:
+    token = request.cookies.get("access_token")
+    if not token:
+        return None
+    return verify_token(token)
+
+
+def require_auth(request: Request):
+    user = get_current_user(request)
+    if not user:
+        raise HTTPException(status_code=401, detail="Not authenticated")
+    return user