Add macOS setup guide for Recovery Mode SIP setup

MACOS_SETUP_GUIDE.md

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+# WeChat CLI — One-Time macOS Setup
+
+> Do this when physically at the machine. After step 6, it never needs repeating.
+
+---
+
+## Step 1 — Find Your WeChat Data Directory
+
+With WeChat logged in, run:
+
+```bash
+ls ~/Library/Containers/com.tencent.xinWeChat/Data/Documents/xwechat_files/*/db_storage/
+```
+
+Note the full path (you'll need it in step 5).
+
+## Step 2 — Quit WeChat
+
+Cmd+Q
+
+## Step 3 — Enter Recovery Mode
+
+- **Apple Silicon**: Press and hold power button → click **Options** → **Continue**
+- **Intel**: Restart and hold **Cmd+R**
+
+## Step 4 — Disable SIP Debug Restriction
+
+In Recovery Mode: **Utilities > Terminal**
+
+```bash
+csrutil enable --without debug
+```
+
+Then: Apple menu > Restart
+
+## Step 5 — Launch WeChat & Extract Keys
+
+Open WeChat from `/Applications`, scan QR code to log in.
+
+Open Terminal and run (replace paths as needed):
+
+```bash
+sudo wechat-cli init \
+  --db-dir "~/Library/Containers/com.tencent.xinWeChat/Data/Documents/xwechat_files/YOUR_WXID/db_storage"
+```
+
+The tool will auto-detect the directory if `--db-dir` is omitted and Full Disk Access is granted. If it auto-detects successfully, just run:
+
+```bash
+sudo wechat-cli init
+```
+
+Expected output shows `[+] 初始化完成!` with key count.
+
+> **Note:** If `task_for_pid` still fails, the tool will automatically re-sign WeChat.app with `get-task-allow`. After re-signing, quit and relaunch WeChat, then run `sudo wechat-cli init` again with explicit `--db-dir`.
+
+## Step 6 — Re-enable SIP Fully
+
+Reboot back into Recovery Mode (same as step 3).
+
+**Utilities > Terminal:**
+
+```bash
+csrutil enable
+```
+
+Restart normally.
+
+## Done
+
+The portal is ready. If using the web UI:
+
+```bash
+cd /path/to/wechat-cli
+bash webui/ctrl.sh start
+```
+
+Open **http://127.0.0.1:5600** in your browser.
+
+---
+
+### Useful commands
+
+| Command | What it does |
+|---|---|
+| `bash webui/ctrl.sh status` | Check if portal is running |
+| `bash webui/ctrl.sh logs` | View server logs |
+| `bash webui/ctrl.sh service install` | Install as launchd (autostart on login) |
+| `bash webui/ctrl.sh service reload` | Restart after code changes |
+
+### After setup
+
+Keys are cached at `~/.wechat-cli/all_keys.json`. The portal and all CLI commands work even without WeChat running — they read locally decrypted files.