docs: add CLAUDE.md with project guidance for Claude Code

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project
+
+Real-time dashboard for monitoring Proxmox VE nodes, VMs, and LXC containers. Next.js 15 App Router with Tailwind CSS 4.
+
+## Commands
+
+```
+npm run dev       # Start dev server (usually on port 3002)
+npm run build     # Production build
+npm run start     # Start production server
+```
+
+## Architecture
+
+```
+src/
+├── app/
+│   ├── api/               # Next.js API routes (server-side)
+│   │   ├── proxy/[...]/route.js   # Reverse proxy to Proxmox web UI
+│   │   ├── vnc/route.js             # VNC ticket fetcher
+│   │   ├── power/route.js           # Power control (start/stop/restart)
+│   │   ├── nodes/vms/lxc/route.js   # Query endpoints (aggregates across nodes)
+│   │   └── status/route.js          # Aggregated summary stats
+│   ├── layout.js          # Root layout (Inter font, metadata)
+│   └── page.js            # Entry — renders <Dashboard />
+├── components/
+│   ├── Dashboard.js       # Main UI: tabs, summary cards, power action handler
+│   ├── NodeList.js / NodeCard.js   # Node overview
+│   ├── VMList.js / LXCList.js     # VM/LXC list views
+│   ├── ConsolePanel.js    # Console embed panel
+│   └── StatusBadge.js     # Status indicator
+└── lib/
+    └── proxmox.js         # Proxmox API client — getNodes, getVMs, getLXC, getSummary, powerControl
+```
+
+## Key Patterns
+
+- **Dual API endpoints**: Queries use `/api2/json`, power operations use `/api2/extjs`. Power actions send empty body `{}`.
+- **API routes** aggregate data across all Proxmox nodes before returning to the client. They are thin wrappers around `lib/proxmox.js`.
+- **Dashboard** uses direct React state + manual `axios.get()` calls for power actions (instant UI sync), and SWR with `refreshInterval` for periodic polling of the same endpoints.
+- **Power action flow**: `handlePowerAction` in Dashboard.js fires `POST /api/power`, then immediately re-fetches all four caches (`/api/nodes`, `/api/vms`, `/api/lxc`, `/api/status`) and sets state directly. Use `requestAnimationFrame` flush before the API call so status messages paint.
+- **Auth**: PVEAPIToken header: `Authorization: PVEAPIToken=${TOKEN_ID}=${TOKEN_SECRET}`.
+- **TLS**: `NODE_TLS_REJECT_UNAUTHORIZED=0` in `.env.local` for self-signed certs. Shows a console warning — acceptable for internal lab use.
+- **Tailwind CSS 4**: Uses `@tailwindcss/postcss` config. CSS vars in `globals.css` for theming.
+- **All API routes return 502 on Proxmox failures** with `{ error, data: null }`.
+
+## Environment Variables
+
+| Variable | Required | Description |
+|---|---|---|
+| `PROXMOX_API_URL` | Yes | Base URL, e.g. `https://host:8006/api2/json` |
+| `PROXMOX_TOKEN_ID` | Yes | API token ID |
+| `PROXMOX_TOKEN_SECRET` | Yes | API token secret |
+| `PROXMOX_WEB_URL` | No | Web UI URL (defaults from PROXMOX_API_URL) |
+| `PROXMOX_CONSOLE_TOKEN` | No | Console session token (defaults from PROXMOX_TOKEN_ID) |
+| `NEXT_PUBLIC_API_POLL_INTERVAL` | No | Poll interval ms (default 30000) |
+| `NODE_TLS_REJECT_UNAUTHORIZED` | No | `0` for self-signed certs |
+
+## Git Workflow
+
+Repository is on Gitea. User works in feature branches, merges via PR. Use clean main as base. Gitea token may need to be embedded in remote URL for auth.