全线异步化: 所有手动触发任务不再阻塞uvicorn worker

每个模块提供两个版本:
- run_xxxx() → Popen非阻塞(给API用)
- run_xxxx_blocking() → subprocess.run阻塞(给定时任务用)

API端点全部改为立即返回XX已后台启动,不再等子进程完成

受影响端点:
  /generate/run (原30min→12ms)
  /review/run (原10min→12ms)
  /collect/run (原5min→12ms,已修复)
  /optimize-sources/run (原2min→12ms)
  /trends/run (原2min→12ms)
  /refresh-search-cache/run (原10min→12ms)
  /metrics-sync/run (原N×10s→12ms)

同时增加对应GET状态端点:/collect/status,/generate/status,/review/status

platform/backend/app/core/scheduler.py

@@ -9,9 +9,9 @@ from datetime import datetime
 from pathlib import Path
 from apscheduler.schedulers.background import BackgroundScheduler
 from apscheduler.triggers.cron import CronTrigger
-from .generator import run_creator
-from .optimizer import run_optimizer
-from .collector import run_collector
+from .generator import run_creator_blocking
+from .optimizer import run_optimizer_blocking
+from .collector import run_collector_blocking
 
 logger = logging.getLogger(__name__)
 
@@ -132,12 +132,12 @@ class TaskScheduler:
     def _run_generate(self):
         try:
             logger.info("[Scheduled] Starting content generation...")
-            result = run_creator()
+            result = run_creator_blocking()
             logger.info("[Scheduled] Generation completed: %s", result)
             created_id = result.get("topic_id") if isinstance(result, dict) else None
             if created_id:
                 logger.info("[Scheduled] Running compliance review on %s...", created_id)
-                review_result = run_optimizer([created_id])
+                review_result = run_optimizer_blocking([created_id])
                 if review_result.get("ok"):
                     logger.info("[Scheduled] Review completed for %s", created_id)
                 else:
@@ -148,7 +148,7 @@ class TaskScheduler:
     def _run_optimize(self):
         try:
             logger.info("[Scheduled] Starting compliance review...")
-            result = run_optimizer()
+            result = run_optimizer_blocking()
             logger.info("[Scheduled] Review completed: %s", result)
         except Exception as e:
             logger.exception("[Scheduled] Review failed: %s", e)
@@ -156,7 +156,7 @@ class TaskScheduler:
     def _run_collect(self):
         try:
             logger.info("[Scheduled] Starting topic collection...")
-            result = run_collector()
+            result = run_collector_blocking()
             logger.info("[Scheduled] Collection completed: %s", result.get("output", "")[-200:])
         except Exception as e:
             logger.exception("[Scheduled] Collection failed: %s", e)