CF BYPASS (#24)

The Calibre dependency was due to the script testing for validity of the
downloaded file, as often they would be corrupted from aa. But CWA is
already doing that, so we are just having redundant code here.

For the cloudflarebypasser, I basically run my own version now, instead
of depending on an external library, this way we have better control for
debugging and on the docker image.

Fixes #18, #33, #27, #48, #65, #78, #86, #88, #89

---------

Co-authored-by: mik593 <91991279+mik593@users.noreply.github.com>

models.py

@@ -3,8 +3,10 @@
 from dataclasses import dataclass, field
 from typing import Dict, List, Optional
 from enum import Enum
-from config import INGEST_DIR, STATUS_TIMEOUT
 from datetime import datetime, timedelta
+from threading import Lock
+
+from config import INGEST_DIR, STATUS_TIMEOUT
 
 class QueueStatus(str, Enum):
     """Enum for possible book queue statuses."""
@@ -31,13 +33,12 @@ class BookInfo:
 
 class BookQueue:
     """Thread-safe book queue manager."""
-    def __init__(self):
-        from threading import Lock
-        self._queue = set()
+    def __init__(self) -> None:
+        self._queue: set[str] = set()
         self._lock = Lock()
-        self._status = {}
-        self._book_data = {}
-        self._status_timestamps = {}  # Track when each status was last updated
+        self._status: dict[str, QueueStatus] = {}
+        self._book_data: dict[str, BookInfo]= {}
+        self._status_timestamps: dict[str, datetime] = {}  # Track when each status was last updated
         self._status_timeout = timedelta(seconds=STATUS_TIMEOUT)  # 1 hour timeout
     
     def add(self, book_id: str, book_data: BookInfo) -> None: