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/models.py

@@ -0,0 +1,54 @@
+from pydantic import BaseModel
+from typing import Optional
+
+
+class ServerCreate(BaseModel):
+    name: str
+    host: str
+    port: int = 22
+    username: str = "root"
+    password: Optional[str] = None
+    ssh_key: Optional[str] = None
+    description: Optional[str] = ""
+
+
+class ServerUpdate(BaseModel):
+    name: Optional[str] = None
+    host: Optional[str] = None
+    port: Optional[int] = None
+    username: Optional[str] = None
+    password: Optional[str] = None
+    ssh_key: Optional[str] = None
+    description: Optional[str] = None
+
+
+class LoginForm(BaseModel):
+    username: str
+    password: str
+
+
+class SettingsUpdate(BaseModel):
+    admin_login: Optional[str] = None
+    admin_password: Optional[str] = None
+    telegram_bot_token: Optional[str] = None
+    telegram_chat_id: Optional[str] = None
+    monitor_interval: Optional[int] = None
+    alert_cpu_threshold: Optional[int] = None
+    alert_ram_threshold: Optional[int] = None
+    alert_disk_threshold: Optional[int] = None
+
+
+class ServerMetrics(BaseModel):
+    cpu_percent: float = 0
+    ram_percent: float = 0
+    ram_used_mb: float = 0
+    ram_total_mb: float = 0
+    disk_percent: float = 0
+    disk_used_gb: float = 0
+    disk_total_gb: float = 0
+    network_in_mb: float = 0
+    network_out_mb: float = 0
+    uptime: str = ""
+    load_average: str = ""
+    online: bool = False
+    last_check: str = ""