feat: 故障推送 / 公需课自动重学 / 插件解耦，发版 v0.0.8

体检修复：启动日志不再打印 AUTH_TOKEN、密钥可清空、推送失败不占整段冷却、目录名与文案统一成 plugins/。

src/study_tool/plugins/gdgxk/utils/login.py

@@ -0,0 +1,52 @@
+"""登录链路：base64 账号密码、图形验证码识别、ITLMS 换票。"""
+import base64
+import re
+import time
+
+from . import http
+
+_OCR = None
+
+
+def b64(text):
+    return base64.b64encode(str(text).encode("utf-8")).decode()
+
+
+def ocr():
+    """4 位图形验证码：ddddocr 离线识别。"""
+    global _OCR
+    if _OCR is None:
+        try:
+            import ddddocr
+        except Exception as e:
+            raise RuntimeError("登录要过图形验证码，需要先装 ddddocr（pip install ddddocr）：%s" % e)
+        _OCR = ddddocr.DdddOcr(show_ad=False)
+    return _OCR
+
+
+def captcha(s):
+    raw = s.get(http.G + "/login/readCaptcha.action?d=%.6f" % time.time(), timeout=30).text
+    return base64.b64decode(raw.strip().strip('"').split(",", 1)[-1])
+
+
+def login_error(s):
+    html = s.get(http.G + "/login.jsp", timeout=30).text
+    m = re.search(r'id="errorText"[^>]*>([^<]*)<', html)
+    return (m.group(1).strip() if m else "")
+
+
+def sso(s):
+    """jsglpt 会话换 ITLMS 票，票按 `ITLMS-xxx||ticketId` 两段交给 jsxx。
+
+    交接入口来自 jsglpt 首页那个隐藏表单：
+    `GET https://jsxx.gds.edu.cn/nts/loginToStoreByAccount?ticket=&ticketId=`
+    """
+    r = s.post(http.G + "/teacher/ssoItlmsGxkTicket.action?verificaCode=true&page=", timeout=30)
+    ticket = (r.text or "").strip()
+    if not ticket.startswith("ITLMS-") or "||" not in ticket:
+        raise http.expired("取 ITLMS 票失败：%s" % (ticket[:80] or "空响应"))
+    t, tid = ticket.split("||", 1)
+    q = s.get(http.X + "/nts/loginToStoreByAccount", params={"ticket": t, "ticketId": tid}, timeout=30)
+    if "logout" not in q.text and "我的课程" not in q.text:
+        raise http.expired("带票进学习平台失败，票可能已失效")
+    return s