添加 GitHub 同步脚本与定时任务

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/README-GitHub同步.md

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+# 卡若AI · GitHub 同步说明
+
+- **本地路径**：`/Users/karuo/Documents/个人/卡若AI`
+- **GitHub 仓库**：https://github.com/fnvtk/karuo-ai
+
+## 手动同步
+```bash
+cd "/Users/karuo/Documents/个人/卡若AI"
+./scripts/push-to-github.sh
+```
+
+## 定时任务
+已安装：每 4 小时自动执行一次同步（有变更才提交并推送）。
+- 卸载：`launchctl unload ~/Library/LaunchAgents/com.karuo.ai.push-github.plist`
+
+## Token
+上传使用的 GitHub Token 由卡路亚提供；若更换账号或 Token，请更新 remote：
+```bash
+git remote set-url origin https://<新TOKEN>@github.com/fnvtk/karuo-ai.git
+```

scripts/com.karuo.ai.push-github.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>Label</key>
+  <string>com.karuo.ai.push-github</string>
+  <key>ProgramArguments</key>
+  <array>
+    <string>/bin/bash</string>
+    <string>/Users/karuo/Documents/个人/卡若AI/scripts/push-to-github.sh</string>
+  </array>
+  <key>StartInterval</key>
+  <integer>14400</integer>
+  <key>WorkingDirectory</key>
+  <string>/Users/karuo/Documents/个人/卡若AI</string>
+  <key>StandardOutPath</key>
+  <string>/tmp/karuo-ai-push-github.log</string>
+  <key>StandardErrorPath</key>
+  <string>/tmp/karuo-ai-push-github.err</string>
+  <key>RunAtLoad</key>
+  <false/>
+</dict>
+</plist>

scripts/push-to-github.sh

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+#!/usr/bin/env bash
+# 卡若AI · 本地 → GitHub 同步（路径：个人/卡若AI）
+# 用法：./scripts/push-to-github.sh [提交说明]
+
+set -e
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$REPO_ROOT"
+
+if ! git remote get-url origin &>/dev/null; then
+  echo "未配置 origin。请执行: git remote add origin <仓库URL>"
+  exit 1
+fi
+
+if git diff --quiet && git diff --cached --quiet && [[ -z $(git status -s) ]]; then
+  echo "[$(date '+%Y-%m-%d %H:%M')] 无变更，跳过推送。"
+  exit 0
+fi
+
+git add -A
+msg="${1:-同步卡若AI：$(date '+%Y-%m-%d %H:%M')}"
+git commit -m "$msg" || true
+git push origin HEAD
+echo "[$(date '+%Y-%m-%d %H:%M')] 已推送到 GitHub。"