feat: add HF Dataset sync scripts

HF_DATASET_SYNC.md

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+# Codex Proxy HF Dataset Sync
+
+## 设置步骤
+
+### 1. 登录 Hugging Face
+
+```bash
+huggingface-cli login
+```
+
+### 2. 创建 Dataset (如果不存在)
+
+在 https://huggingface.co/new 创建 `lenson78/codex-proxy-data`
+
+### 3. 同步配置到 HF
+
+```bash
+HF_TOKEN=hf_xxx ./sync-to-hf.sh
+```
+
+或在 Space secrets 中设置 `HF_TOKEN`
+
+## 用途
+
+codex-proxy 的账号、cookies、配置等数据会持久化保存到 HF Dataset，避免容器重建后丢失。

sync-to-hf.sh

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+#!/bin/bash
+set -e
+
+echo "========================================"
+echo "  Codex Proxy - Sync to HF Dataset"
+echo "========================================"
+
+HF_DATASET_NAME="${HF_DATASET_NAME:-lenson78/codex-proxy-data}"
+HF_TOKEN="${HF_TOKEN:-}"
+
+if [ -z "$HF_TOKEN" ]; then
+    echo "Error: HF_TOKEN not set"
+    echo "Usage: HF_TOKEN=hf_xxx ./sync-to-hf.sh"
+    exit 1
+fi
+
+export HF_TOKEN
+
+echo "Uploading data/ directory..."
+huggingface-cli upload "$HF_DATASET_NAME" data/ --repo-type dataset --quiet || true
+
+echo "Uploading config/ directory..."
+huggingface-cli upload "$HF_DATASET_NAME" config/ --repo-type dataset --quiet || true
+
+echo "Done! Config synced to $HF_DATASET_NAME"