chore(zendriver): pin 0.15.3 and bump plugin version

- pin automatic zendriver installation to 0.15.3
- align manual install guidance with the pinned version
- bump anime_downloader plugin version to 0.7.18

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>

mod_ohli24.py

@@ -206,7 +206,7 @@ class LogicOhli24(AnimeModuleBase):
         # 자동 설치 시도
         try:
             logger.info("[Zendriver] Not found, installing via pip...")
-            cmd = [sys.executable, "-m", "pip", "install", "zendriver", "-q"]
+            cmd = [sys.executable, "-m", "pip", "install", "zendriver==0.15.3", "-q"]
             result = sp.run(cmd, capture_output=True, text=True, timeout=120)
             
             if result.returncode == 0: