fix: 经验保存缺 app context（后台线程 db 报错被吞）——register_blueprints 注入 app，线程内 db 操作包 app_context

web/__init__.py

@@ -23,7 +23,9 @@ def register_blueprints(app):
     from .devices_api import bp as devices_bp
     from .apks_api import bp as apks_bp
     from .tailscale_api import bp as tailscale_bp
+    from . import agent_api as _agent_mod
     from .agent_api import bp as agent_bp
+    _agent_mod.set_app(app)
     for bp in (auth_bp, monitor_bp, tasks_bp, admin_bp, tools_bp,
                devices_bp, apks_bp, tailscale_bp, agent_bp):
         app.register_blueprint(bp)

web/agent_api.py

@@ -43,6 +43,12 @@ _run = {"id": None, "state": "idle", "prompt": "", "serial": "",
 _queues = {}            # run_id -> queue.Queue（SSE 消费者读取）
 _stop_events = {}       # run_id -> threading.Event（用户中断）
 _lock = threading.Lock()
+_flask_app = None       # web_server 注册时注入（后台线程 db 操作需 app context）
+
+
+def set_app(app):
+    global _flask_app
+    _flask_app = app
 
 
 def _meta_get(key):
@@ -90,6 +96,9 @@ def _bigrams(text):
 def _find_experiences(prompt, limit=2, threshold=0.10):
     """按 bigram 重叠检索相似历史经验（prompt 与任务描述的字符相似度）。"""
     try:
+        if _flask_app is None:
+            return ""
+        with _flask_app.app_context():
             _ensure_exp_table()
             rows = db.session.execute(db.text(
                 "SELECT task_prompt, recipe, hits FROM agent_experience "
@@ -141,7 +150,11 @@ def _distill_experience(cfg, prompt, tool_seq):
 
 
 def _save_experience(prompt, recipe, tool_seq):
+    """保存经验（后台线程调用，包 app context）。"""
     try:
+        if _flask_app is None:
+            return
+        with _flask_app.app_context():
             _ensure_exp_table()
             from datetime import datetime
             db.session.execute(db.text(