fix: fetcher 数据库路径可移植化（db.py get_conn 统一，去除 Windows 硬编码）

deploy/e2e_server_test.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+"""服务器端端到端验证：宇宙 40 只 → K线同步 → 打分 → 推荐卡（在服务器 venv 内执行）"""
+import sys, warnings, time
+sys.path.insert(0, '/opt/a_stock_timeline')
+warnings.filterwarnings('ignore')
+from src.fetcher.kline_fetcher import KlineFetcher
+from src.quant.engine import QuantEngine
+
+DB = '/opt/a_stock_timeline/data/a_stock.db'
+eng = QuantEngine(emit=lambda e: print('[emit]', e['kind'], flush=True), db_path=DB)
+codes, names = eng.universe(40)
+print('宇宙股票:', len(codes), flush=True)
+kf = KlineFetcher(DB)
+t0 = time.time()
+ok = 0
+for i, c in enumerate(codes):
+    ok += 1 if kf.sync(c, 'day', days=150) else 0
+    if (i + 1) % 10 == 0:
+        print('  进度 {}/{} 成功{} 用时{:.0f}s'.format(i + 1, len(codes), ok, time.time() - t0), flush=True)
+print('K线同步完成: 成功 {} 只，用时 {:.0f}s'.format(ok, time.time() - t0), flush=True)
+recs = eng.build_recommendations(10)
+print('=== 推荐卡（Top 10）===', flush=True)
+for r in recs:
+    print('★{stars} {name}({code}) 现价{price} 购入{buy_low}~{buy_high} 预计{er}% | {reason}'.format(
+        stars=r['stars'], name=r['name'], code=r['code'], price=r['price'],
+        buy_low=r['buy_low'], buy_high=r['buy_high'],
+        er=r['expected_return_pct'] if r['expected_return_pct'] is not None else '—',
+        reason=r['reason']), flush=True)
+print('E2E DONE', flush=True)