feat: 管理员页面整合与侧边栏导航优化

- 完成系统管理页面与导航整合
- 在 users.html/topics.html/logs.html 侧边栏与移动导航添加系统管理入口
- 创建 admin.html 管理页面（案例/任务日志/LLM配置/系统配置）
- 新增核心模块：collector.py（数据采集器）、scheduler.py（任务调度器）
- 新增脚本：collector_db_integration.py（采集器数据库整合）
- 更新项目文档并验证路由注册

platform/backend/app/core/collector.py

@@ -0,0 +1,31 @@
+"""
+选题收集模块
+调用 scripts/collector.py 脚本，从外部来源收集/生成新选题并写入 JSON
+"""
+import subprocess
+from pathlib import Path
+import logging
+import os
+
+logger = logging.getLogger(__name__)
+
+# 计算项目根目录
+PROJECT_ROOT = Path(__file__).resolve().parents[4]
+if os.getenv('PROJECT_ROOT'):
+    PROJECT_ROOT = Path(os.getenv('PROJECT_ROOT'))
+
+def run_collector():
+    """运行选题收集脚本"""
+    script_path = PROJECT_ROOT / "scripts" / "collector.py"
+    if not script_path.exists():
+        raise FileNotFoundError(f"Collector script not found: {script_path}")
+    result = subprocess.run(
+        ["python", str(script_path)],
+        capture_output=True,
+        text=True,
+        cwd=PROJECT_ROOT,
+        timeout=300
+    )
+    if result.returncode != 0:
+        raise RuntimeError(f"Collector failed: {result.stderr}")
+    return {"ok": True, "output": result.stdout}

platform/backend/app/core/scheduler.py

@@ -0,0 +1,94 @@
+"""
+定时任务调度器
+基于 APScheduler，支持在 FastAPI 生命周期内运行定时任务
+"""
+import os
+import logging
+from datetime import datetime
+from apscheduler.schedulers.background import BackgroundScheduler
+from apscheduler.triggers.cron import CronTrigger
+from .generator import run_creator
+from .optimizer import run_optimizer
+from .sync import sync_all_topics
+
+logger = logging.getLogger(__name__)
+
+class TaskScheduler:
+    def __init__(self):
+        self.scheduler = BackgroundScheduler()
+        self._started = False
+
+    def start(self):
+        if self._started:
+            logger.warning("Scheduler already started")
+            return
+        # 使用 CronTrigger 设置每日固定时间点
+        self.scheduler.add_job(
+            self._run_sync,
+            CronTrigger(hour=2, minute=30),
+            id='scheduled_sync',
+            replace_existing=True,
+            max_instances=1,
+            coalesce=True
+        )
+        self.scheduler.add_job(
+            self._run_generate,
+            CronTrigger(hour=3, minute=30),
+            id='scheduled_generate',
+            replace_existing=True,
+            max_instances=1,
+            coalesce=True
+        )
+        self.scheduler.add_job(
+            self._run_optimize,
+            CronTrigger(hour=4, minute=30),
+            id='scheduled_optimize',
+            replace_existing=True,
+            max_instances=1,
+            coalesce=True
+        )
+        self.scheduler.start()
+        self._started = True
+        logger.info("Scheduler started with daily cron triggers (02:30, 03:30, 04:30)")
+    def shutdown(self):
+        if self.scheduler.running:
+            self.scheduler.shutdown()
+            logger.info("Scheduler shut down")
+
+    def _run_generate(self):
+        try:
+            logger.info("[Scheduled] Starting content generation...")
+            result = run_creator()
+            logger.info("[Scheduled] Generation completed: %s", result)
+        except Exception as e:
+            logger.exception("[Scheduled] Generation failed: %s", e)
+
+    def _run_optimize(self):
+        try:
+            logger.info("[Scheduled] Starting compliance optimization...")
+            result = run_optimizer()
+            logger.info("[Scheduled] Optimization completed: %s", result)
+        except Exception as e:
+            logger.exception("[Scheduled] Optimization failed: %s", e)
+
+    def _run_sync(self):
+        try:
+            logger.info("[Scheduled] Starting data sync...")
+            sync_all_topics()
+            logger.info("[Scheduled] Sync completed")
+        except Exception as e:
+            logger.exception("[Scheduled] Sync failed: %s", e)
+
+    def get_jobs(self):
+        """返回当前所有定时任务的状态"""
+        jobs = []
+        for job in self.scheduler.get_jobs():
+            jobs.append({
+                "id": job.id,
+                "next_run_time": job.next_run_time.isoformat() if job.next_run_time else None,
+                "trigger": str(job.trigger),
+            })
+        return jobs
+
+# 全局单例
+scheduler = TaskScheduler()