Initial commit: combine nas_tool, nas_webdav, sync-utils

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+# Shadowrocket Setup for Cellular Data
+
+## The Solution
+
+Since iOS doesn't support HTTP proxy for cellular data, you need to use **Shadowrocket VPN mode**. Here's how:
+
+## Setup Steps
+
+### Step 1: Configure Server (Already Done ✅)
+- Clash now listens on all interfaces
+- Firewall allows Tailscale network (100.x.x.x) only
+- Proxy accessible at: `100.70.115.1:7890`
+
+### Step 2: On Your iPhone
+
+**Option A: Use Shadowrocket VPN Mode (Recommended for Cellular)**
+
+1. **Disable Tailscale VPN:**
+   - Open Tailscale app
+   - Toggle VPN OFF (but keep app installed/running)
+   - This frees up the VPN slot for Shadowrocket
+
+2. **Configure Shadowrocket:**
+   - Open Shadowrocket
+   - Go to **Home** tab
+   - Tap **"+"** to add server
+   - Select **HTTP**
+   - Enter:
+     - **Address:** `100.70.115.1`
+     - **Port:** `7890`
+     - **Remark:** `server2-proxy`
+   - Tap **Done**
+
+3. **Enable Shadowrocket:**
+   - Select `server2-proxy` in Home tab
+   - Toggle switch **ON**
+   - VPN icon should appear in status bar
+
+4. **Test:**
+   - Open Safari
+   - Visit: https://api.ipify.org
+   - Should show: `158.101.140.85` (server2's IP)
+   - Works on both Wi-Fi and cellular! ✅
+
+**How it works:**
+- Shadowrocket creates a VPN connection
+- It routes all traffic (Wi-Fi + cellular) through the proxy
+- Traffic goes: iPhone → Shadowrocket VPN → Tailscale network → server2 proxy → Internet
+
+**Note:** You'll lose direct Tailscale network access (can't SSH to other Tailscale devices), but proxy will work on both Wi-Fi and cellular.
+
+### Option B: Keep Tailscale VPN, Use System Proxy (Wi-Fi Only)
+
+If you need Tailscale network access:
+
+1. **Keep Tailscale VPN ON**
+2. **Don't use Shadowrocket VPN mode**
+3. Configure system proxy for Wi-Fi:
+   - Settings → Wi-Fi → ⓘ → HTTP Proxy → Manual
+   - Server: `100.70.115.1`
+   - Port: `7890`
+4. **Cellular won't work** with this method (iOS limitation)
+
+## Recommendation
+
+**Use Option A (Shadowrocket VPN mode)** if you:
+- Need proxy on cellular data
+- Don't need direct Tailscale network access while using proxy
+- Want it to work everywhere
+
+**Use Option B (System proxy)** if you:
+- Only need proxy on Wi-Fi
+- Need direct Tailscale network access
+- Can live without cellular proxy
+
+## Switching Between Modes
+
+You can easily switch:
+- **Need proxy on cellular?** → Disable Tailscale VPN, enable Shadowrocket VPN
+- **Need Tailscale network?** → Disable Shadowrocket VPN, enable Tailscale VPN
+- **Need both?** → Use system proxy on Wi-Fi (but no cellular proxy)
+
+## Testing
+
+After setup:
+1. Turn OFF Wi-Fi (use cellular only)
+2. Open Safari
+3. Visit: https://api.ipify.org
+4. Should show server2's IP: `158.101.140.85`
+5. If it shows your cellular IP, proxy isn't working
+
+## Troubleshooting
+
+**Proxy not working on cellular?**
+- Make sure Shadowrocket VPN is enabled (VPN icon in status bar)
+- Check that server2 is online: `ssh server2 'sudo systemctl status clash-meta'`
+- Verify Tailscale network is reachable (even with VPN off, the network should exist)
+
+**Can't reach other Tailscale devices?**
+- That's expected when Shadowrocket VPN is on
+- Disable Shadowrocket VPN and enable Tailscale VPN when you need direct access
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