feat: Implement account pooling for concurrent scheduling and introduce a new permissions module.

account_store.py

@@ -12,6 +12,61 @@ _ACCOUNTS_FILE = Path(__file__).parent / "accounts.txt"
 _STATS_FILE = Path(__file__).parent / "stats.json"
 _lock = threading.Lock()
 
+# ====== 账号池（并发调度）======
+# _busy 记录当前被占用的账号行（原始字符串）
+_busy: set[str] = set()
+
+
+def acquire(n: int = 0) -> list[str]:
+    """从空闲账号中获取最多 n 个，标记为占用。
+
+    Args:
+        n: 需要的账号数。0 表示尽量获取所有空闲账号（至少 1 个）。
+
+    Returns:
+        被获取的账号行列表（可能少于 n），为空表示没有空闲账号。
+    """
+    with _lock:
+        try:
+            with open(_ACCOUNTS_FILE, "r", encoding="utf-8") as f:
+                all_lines = [line.strip() for line in f if line.strip()]
+        except FileNotFoundError:
+            return []
+
+        free = [line for line in all_lines if line not in _busy]
+        if not free:
+            return []
+
+        if n <= 0:
+            # 获取全部空闲
+            acquired = free
+        else:
+            acquired = free[:n]
+
+        _busy.update(acquired)
+        return acquired
+
+
+def release(lines: list[str]) -> None:
+    """释放指定账号，标记为空闲。"""
+    with _lock:
+        for line in lines:
+            _busy.discard(line)
+
+
+def pool_status() -> dict:
+    """返回账号池状态。"""
+    with _lock:
+        try:
+            with open(_ACCOUNTS_FILE, "r", encoding="utf-8") as f:
+                all_lines = [line.strip() for line in f if line.strip()]
+        except FileNotFoundError:
+            all_lines = []
+
+        total = len(all_lines)
+        busy = sum(1 for line in all_lines if line in _busy)
+        return {"total": total, "busy": busy, "free": total - busy}
+
 
 # ====== 账号操作 ======