feat(openinsider): 新增 OpenInsider 內部人交易爬蟲，支援多標的與每日排程

- 新增 app/crawlers/openinsider.py，來源 http://openinsider.com/search?q={symbol}

- 支援多標的：以 SYMBOLS=PLTR,NVDA,... 同時追多檔（或使用 SYMBOL 單一）

- runner: 多實例排程與啟動；/check 會依序觸發全部爬蟲

- API: /info、/stats、/check、/notify_test 支援多爬蟲回應

- config/base: 新增 RUN_DAILY_AT 每日固定時間；未設定則用 CHECK_INTERVAL

- notifications: 新增 send_custom_email、send_text_webhook、send_text_discord

- README 與 .env.template 更新；.env 改為 CRAWLER_TYPE=openinsider

- 移除 quiver_insiders 爬蟲與相關設定

BREAKING CHANGE: 不再支援 CRAWLER_TYPE=quiver_insiders；請改用 openinsider。

app/services/notifications.py

@@ -42,6 +42,27 @@ def send_email(new_picks: List[Dict], cfg: EmailConfig) -> None:
     server.quit()
 
 
+def send_custom_email(subject: str, body: str, cfg: EmailConfig) -> None:
+    msg = MIMEMultipart()
+    msg['From'] = cfg.from_email
+    msg['To'] = cfg.to_email
+    msg['Subject'] = subject
+    msg.attach(MIMEText(body, 'plain', 'utf-8'))
+
+    if cfg.smtp_security == 'ssl':
+        server = smtplib.SMTP_SSL(cfg.smtp_server, cfg.smtp_port)
+    else:
+        server = smtplib.SMTP(cfg.smtp_server, cfg.smtp_port)
+        server.ehlo()
+        if cfg.smtp_security == 'starttls':
+            server.starttls()
+            server.ehlo()
+
+    server.login(cfg.username, cfg.password)
+    server.send_message(msg)
+    server.quit()
+
+
 def send_webhook(new_picks: List[Dict], url: str) -> None:
     message = f"🚨 發現 {len(new_picks)} 條新的 Barron's 股票推薦！\n\n"
     for pick in new_picks[:5]:
@@ -53,6 +74,11 @@ def send_webhook(new_picks: List[Dict], url: str) -> None:
     requests.post(url, json=payload, timeout=10)
 
 
+def send_text_webhook(message: str, url: str) -> None:
+    payload = {"text": message}
+    requests.post(url, json=payload, timeout=10)
+
+
 def send_discord(new_picks: List[Dict], webhook: str) -> None:
     embed = {
         "title": "📈 Barron's 新股票推薦",
@@ -69,6 +95,22 @@ def send_discord(new_picks: List[Dict], webhook: str) -> None:
     requests.post(webhook, json={"embeds": [embed]}, timeout=10)
 
 
+def send_text_discord(title: str, description: str, lines: List[str], webhook: str) -> None:
+    embed = {
+        "title": title,
+        "description": description,
+        "color": 0x00ff00,
+        "fields": [],
+    }
+    for line in lines[:10]:
+        embed["fields"].append({
+            "name": line[:256],
+            "value": "\u200b",
+            "inline": False,
+        })
+    requests.post(webhook, json={"embeds": [embed]}, timeout=10)
+
+
 def build_test_pick() -> Dict:
     return {
         'title': f"[測試] Barron's 通知發送 - {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}",
@@ -76,4 +118,3 @@ def build_test_pick() -> Dict:
         'scraped_at': datetime.now().isoformat(),
         'hash': hashlib.md5(str(datetime.now().timestamp()).encode()).hexdigest()[:8],
     }
-