fix: EasyOCR启动异常+超时保护+消息搅和隔离

1. 修复负冷却时间bug：启动失败时若未设置冷却，现在设置30s冷却
2. EasyOCR worker添加超时保护：readtext()使用concurrent.futures包装，30s超时
3. Windows OCR消息搅和隔离：EasyOCR超时+Windows OCR多时间戳→返回空结果
4. 添加easyocr_worker_state.json到.gitignore

easyocr_worker.py

@@ -286,8 +286,10 @@ def _init_reader():
         return reader
 
 
-def _process_image(img_b64: str, reader) -> str:
-    """解码 base64 图片 → EasyOCR 识别 → 返回空格拼接文本。"""
+def _process_image(img_b64: str, reader, timeout: float = 30.0) -> str:
+    """解码 base64 图片 → EasyOCR 识别 → 返回空格拼接文本。
+    timeout: 单张图片OCR超时秒数，防止GPU/CPU推理卡死。
+    """
     if reader is None:
         return ""
     raw = base64.b64decode(img_b64)
@@ -296,7 +298,23 @@ def _process_image(img_b64: str, reader) -> str:
     if img.mode != "RGBA":
         img = img.convert("RGBA")
     img_np = np.array(img)
-    results = reader.readtext(img_np)
+
+    # ⭐ 超时保护：用 concurrent.futures 包装 readtext，防止GPU推理卡死
+    from concurrent.futures import ThreadPoolExecutor, TimeoutError as FuturesTimeoutError
+    with ThreadPoolExecutor(max_workers=1) as executor:
+        future = executor.submit(reader.readtext, img_np)
+        try:
+            results = future.result(timeout=timeout)
+        except FuturesTimeoutError:
+            sys.stderr.write(f"[easyocr_worker] readtext 超时({timeout}s)，放弃本次OCR\n")
+            sys.stderr.flush()
+            _write_crash_log(f"{datetime.now()} [easyocr_worker] readtext 超时({timeout}s)")
+            return ""
+        except Exception as e:
+            sys.stderr.write(f"[easyocr_worker] readtext 异常: {e}\n")
+            sys.stderr.flush()
+            raise
+
     return "\n".join([r[1] for r in results]).strip()