chore: 完成正式代码包结构

创建 app 包与 main.py 入口，将根目录 cdp.py 迁入 app/cdp.py，并保留最小 app.gui 占位入口。

修正 prototypes/demo.py 与 demo.bat，让原型脚本从项目根导入 app.cdp。

更新任务看板、当前状态和进度记录，标记 T-000 完成并记录本机 Python 解释器差异。

app/cdp.py

@@ -0,0 +1,146 @@
+#!/usr/bin/env python3
+# app/cdp.py —— 共享 CDP 底座：连接 Chrome、定位/打开商品 tab、执行 JS、模拟拖拽。
+# 被正式模块和 prototypes/demo.py 复用。
+#
+# 依赖：pip install websocket-client requests
+
+import os
+
+# CDP 局域网直连，绝不走代理（WSL 里 *_proxy 指向 :1080 会导致超时）。
+for _k in ("ALL_PROXY", "all_proxy", "HTTP_PROXY", "http_proxy", "HTTPS_PROXY", "https_proxy"):
+    os.environ.pop(_k, None)
+
+import json
+import time
+import threading
+
+CDP_HOST = os.environ.get("CDP_HOST", "127.0.0.1:9222")
+BASE = f"http://{CDP_HOST}"
+
+
+def http_get(path):
+    import requests
+
+    s = requests.Session()
+    s.trust_env = False  # 忽略环境代理
+    return s.get(f"{BASE}{path}", timeout=10).json()
+
+
+class CDP:
+    """单个 target 的 CDP 客户端：命令同步、事件回调异步。"""
+
+    def __init__(self, ws_url):
+        from websocket import create_connection
+
+        # suppress_origin=True：不发 Origin 头，避免 Chrome 未开 --remote-allow-origins 时 403。
+        self.ws = create_connection(ws_url, max_size=None, suppress_origin=True)
+        self._id = 0
+        self._res = {}
+        self._cond = threading.Condition()
+        self._handlers = []
+        self._stop = False
+        threading.Thread(target=self._loop, daemon=True).start()
+
+    def _loop(self):
+        while not self._stop:
+            try:
+                raw = self.ws.recv()
+            except Exception:
+                break
+            if not raw:
+                continue
+            m = json.loads(raw)
+            if "id" in m:
+                with self._cond:
+                    self._res[m["id"]] = m
+                    self._cond.notify_all()
+            elif "method" in m:
+                for h in self._handlers:
+                    try:
+                        h(m)
+                    except Exception:
+                        pass
+
+    def on(self, fn):
+        self._handlers.append(fn)
+
+    def send(self, method, params=None, timeout=30):
+        self._id += 1
+        mid = self._id
+        self.ws.send(json.dumps({"id": mid, "method": method, "params": params or {}}))
+        end = time.time() + timeout
+        with self._cond:
+            while mid not in self._res:
+                left = end - time.time()
+                if left <= 0:
+                    raise TimeoutError(f"CDP {method} 超时")
+                self._cond.wait(left)
+            m = self._res.pop(mid)
+        if "error" in m:
+            raise RuntimeError(f"{method}: {m['error'].get('message')}")
+        return m.get("result", {})
+
+    def ev(self, expr, by_value=True):
+        r = self.send("Runtime.evaluate", {"expression": expr, "returnByValue": by_value})
+        if "exceptionDetails" in r:
+            raise RuntimeError("JS 异常: " + r["exceptionDetails"].get("text", ""))
+        return r.get("result", {})
+
+    def val(self, expr):
+        return self.ev(expr).get("value")
+
+    def object_id(self, expr):
+        return self.ev(expr, by_value=False).get("objectId")
+
+    def drag(self, x0, y0, x1, y1, steps=34):
+        """按住源点 → 多步移动到目标点 → 释放，驱动自定义拖拽排序库。"""
+        me = "Input.dispatchMouseEvent"
+        self.send(me, {"type": "mouseMoved", "x": x0, "y": y0})
+        self.send(me, {"type": "mousePressed", "x": x0, "y": y0, "button": "left", "buttons": 1, "clickCount": 1})
+        for dx in (3, 6, 10):  # 小幅抖动，越过拖拽启动阈值
+            self.send(me, {"type": "mouseMoved", "x": x0 + dx, "y": y0, "button": "left", "buttons": 1})
+            time.sleep(0.03)
+        for i in range(1, steps + 1):
+            x = x0 + (x1 - x0) * i / steps
+            y = y0 + (y1 - y0) * i / steps
+            self.send(me, {"type": "mouseMoved", "x": x, "y": y, "button": "left", "buttons": 1})
+            time.sleep(0.025)
+        for _ in range(10):  # 在目标点停留，让排序库吸附
+            self.send(me, {"type": "mouseMoved", "x": x1, "y": y1, "button": "left", "buttons": 1})
+            time.sleep(0.05)
+        self.send(me, {"type": "mouseReleased", "x": x1, "y": y1, "button": "left", "buttons": 0, "clickCount": 1})
+
+    def close(self):
+        self._stop = True
+        try:
+            self.ws.close()
+        except Exception:
+            pass
+
+
+def find_product_tab(item_id):
+    """在已打开的 tab 里找 URL 同时含 item_id 和 shopee.tw 的页面。"""
+    for t in http_get("/json"):
+        if t.get("type") != "page":
+            continue
+        url = t.get("url") or ""
+        if item_id in url and "shopee.tw" in url:
+            return t
+    return None
+
+
+def create_tab(url):
+    """用 browser 级 Target.createTarget 新建 tab，返回其 page websocket。"""
+    ver = http_get("/json/version")
+    b = CDP(ver["webSocketDebuggerUrl"])
+    try:
+        tid = b.send("Target.createTarget", {"url": url})["targetId"]
+    finally:
+        b.close()
+    end = time.time() + 15
+    while time.time() < end:
+        for t in http_get("/json"):
+            if t.get("id") == tid and t.get("webSocketDebuggerUrl"):
+                return t["webSocketDebuggerUrl"]
+        time.sleep(0.5)
+    raise TimeoutError("等待新 tab websocket 超时")