refactor(plugins): 莞易学迁到 pugins/guanyixue

- platforms/guanyixue.py → pugins/guanyixue/main.py
- jspx.py / study.py / detect.py 一并搬进插件目录，插件自包含：
  热重载会把实现模块一起重新 import，不再是半截插件
- 导入路径改成 study_tool.pugins.guanyixue.*；quiz.py 两处引用同步更新
- platforms/__init__.py 只剩运行时，load_builtin() 只调 load_plugins()
- 新增 pugins/guanyixue/pugin.json（id / title / name）
- 同步 AGENTS.md、docs/architecture.md、docs/pugin.md、docs/OPTIMIZATION.md

src/study_tool/platforms/__init__.py

@@ -1,11 +1,11 @@
 """平台包。
 
-平台实现有两个落点，写法和契约完全一样（`Platform` 子类 + 注册一次）：
+这里放平台**运行时**：`Platform` 契约（`base.py`）、能力映射（`contract.py`）、
+错误类型（`errors.py`）、注册表（`registry.py`）。
 
-  - `pugins/<名字>/`：插件式平台（`pugin.json` + `main.py`），由 `study_tool.pugins.load_plugins()`
-    扫描加载，新增插件不需要改这里的任何代码；
-  - `platforms/<名字>.py`：跟共享实现模块（`jspx.py` / `study.py`）关系紧密的平台，直接在
-    `load_builtin()` 里 import。
+平台实现都放在插件目录 `pugins/<名字>/`（`pugin.json` + `main.py`，可以再拆实现模块），
+由 `study_tool.pugins.load_plugins()` 扫描加载；新增或迁移插件都不用改这里的代码。
+要是有多个插件共用的实现模块，才放回本目录。
 
 路由 / 引擎不用改 —— 它们只认 `course["platform"]`。
 """
@@ -14,7 +14,6 @@ from study_tool.platforms.base import Platform  # noqa: F401
 
 
 def load_builtin():
-    """导入内置平台与 `pugins/` 下的插件，触发注册。幂等，app 启动时调用一次。"""
-    from study_tool.platforms import guanyixue   # noqa: F401
+    """加载 `pugins/` 下的全部插件（导入即注册）。幂等，app 启动时调用一次。"""
     from study_tool.pugins import load_plugins
     load_plugins()

src/study_tool/pugins/guanyixue/__init__.py

@@ -0,0 +1 @@
+"""莞易学插件：`main.py` 注册平台，`jspx.py` 旧版页面、`study.py` 新版 SPA、`detect.py` 代际识别。"""

src/study_tool/pugins/guanyixue/jspx.py

@@ -15,7 +15,7 @@ from bs4 import BeautifulSoup
 
 from study_tool.config import *
 from study_tool.platforms import registry
-from study_tool.platforms.detect import detect_generation, has_study_marker
+from study_tool.pugins.guanyixue.detect import detect_generation, has_study_marker
 from study_tool.runtime import RUNS, RUNS_LOCK, log, set_state
 
 # ------------------------------------------------------------------------ crypto
@@ -301,7 +301,7 @@ def ensure_study_session(s, force=False):
              -> {"result":{"url":".../training","token":"<jwt>"}}   # 这才是 Middle-Token
     成功标准只有一个：cookie 里出现 study.dgjy.net 的 Middle-Token。
     """
-    from study_tool.platforms.study import _study_token
+    from study_tool.pugins.guanyixue.study import _study_token
     if force:
         for c in list(s.cookies):
             if c.name == "Middle-Token":
@@ -369,7 +369,7 @@ def _fetch_train_token(s):
 
 def _exchange_code(s, code):
     """code -> Middle-Token。前端是 POST /mod/gjt/login/<code>，再取 gyx 培训 token。"""
-    from study_tool.platforms.study import _study_token
+    from study_tool.pugins.guanyixue.study import _study_token
     paths = ("/mod/gjt/login/%s", "/train/mod/gjt/login/%s")
     for path in paths:
         try:
@@ -557,7 +557,7 @@ def discover(s, plan, project, name=""):
 
 def _discover_once(s, plan, project, name=""):
     # study.py 反向 import 本模块，模块级 import 会成环，用到时再取
-    from study_tool.platforms.study import (StudyClient, discover_study, extract_study_token,
+    from study_tool.pugins.guanyixue.study import (StudyClient, discover_study, extract_study_token,
                                             extract_train_id, save_snapshot,
                                             study_resolve_train_id)
     url = "%s/train/trainee/courseStudyMain.action?planId=%s&projectId=%s&trainRole=0" % (JSPX, plan, project)

src/study_tool/pugins/guanyixue/main.py

@@ -5,7 +5,8 @@
 `course["generation"]`（legacy / spa），由 `study` 分发到对应实现。
 新增其他平台时，照本文件写一个 `Platform` 子类并在 `entries` 声明登录 / 学习入口。
 """
-from study_tool.platforms import jspx, registry, study
+from study_tool.platforms import registry
+from study_tool.pugins.guanyixue import jspx, study
 from study_tool.platforms.base import Platform
 
 

src/study_tool/pugins/guanyixue/pugin.json

@@ -0,0 +1,5 @@
+{
+  "id": "guanyixue",
+  "title": "莞易学（东莞市教师培训平台）",
+  "name": "guanyixue"
+}

src/study_tool/pugins/guanyixue/study.py

@@ -9,7 +9,7 @@ from bs4 import BeautifulSoup
 
 from study_tool import store
 from study_tool.config import *
-from study_tool.platforms.jspx import *
+from study_tool.pugins.guanyixue.jspx import *
 from study_tool.runtime import RUNS, log, set_state
 
 # ------------------------------------------------------- 新版平台：页面识别/提取

src/study_tool/quiz.py

@@ -12,8 +12,8 @@ from study_tool.config import *
 from study_tool.llm import *
 from study_tool.models import *
 from study_tool.platforms import registry
-from study_tool.platforms.jspx import new_session, parse_ids
-from study_tool.platforms.study import StudyClient
+from study_tool.pugins.guanyixue.jspx import new_session, parse_ids
+from study_tool.pugins.guanyixue.study import StudyClient
 from study_tool.runtime import log
 
 # ------------------------------------------------------------------ quiz