fix(easyocr): 顶层崩溃全程留痕，消除"一声不吭"结束进程

- easyocr_worker.py: 新增 worker 状态文件 easyocr_worker_state.json
  (pid/mode/status/last_img_len/ts/error)，就绪/忙碌/空闲实时落盘；
  强化 sys.excepthook / _flush_exit / _signal_handler 崩溃写状态+crash.log
- monitor.py: _kill_easyocr_proc 杀前诊断三路
  (状态文件 + 残留stderr + crash.log尾)，以 warning 汇总进主日志；
  _read_easyocr_crash_tail 新增 ignore_age 跳过60s时间窗用于诊断路径
- unicode_radicals.md: 丿(U+4E3F)行改 - 不参与偏旁过滤，修复OCR碎片误杀儿下载等

easyocr_worker.py

@@ -58,6 +58,44 @@ def _get_crash_log_path() -> str:
 
 CRASH_LOG = _get_crash_log_path()
 
+# ── 状态文件：记录 worker 当前在处理什么/卡多久，父进程 kill 前读取，避免"一声不吭" ──
+def _get_state_path() -> str:
+    try:
+        base = os.path.dirname(os.path.abspath(__file__))
+    except Exception:
+        base = "."
+    return os.path.join(base, "easyocr_worker_state.json")
+
+
+STATE_PATH = _get_state_path()
+
+# worker 当前运行模式（GPU/CPU），由 _init_reader 设置
+_WORKER_MODE = "未知"
+
+
+def _write_state(status: str, last_img_len: int = 0, ts: float = None, error: str = ""):
+    """把当前 worker 状态落盘为 JSON，便于父进程 kill 前诊断死前状态。
+
+    status: idle / busy / crashed / terminated
+    """
+    try:
+        _ts = ts if ts is not None else datetime.now().timestamp()
+        _rec = {
+            "pid": os.getpid(),
+            "mode": _WORKER_MODE,
+            "status": status,
+            "last_img_len": last_img_len,
+            "ts": _ts,
+            "iso": datetime.fromtimestamp(_ts).isoformat() if _ts else "",
+            "error": error,
+        }
+        with open(STATE_PATH, "w", encoding="utf-8") as f:
+            json.dump(_rec, f, ensure_ascii=False)
+            f.flush()
+    except Exception:
+        pass
+
+
 def _write_crash_log(msg: str):
     try:
         with open(CRASH_LOG, "a", encoding="utf-8") as f:
@@ -72,6 +110,7 @@ def _flush_exit(msg, code=1):
     sys.stderr.write(full + "\n")
     sys.stderr.flush()
     _write_crash_log(f"{datetime.now()} {full}")
+    _write_state("crashed", error=full[:500])
     sys.exit(code)
 
 # ── 全局未捕获异常钩子：任何漏网的 Python 异常都落盘 ──
@@ -80,6 +119,7 @@ def _global_excepthook(exc_type, exc_val, exc_tb):
     sys.stderr.write(f"[easyocr_worker] 未捕获异常:\n{msg}")
     sys.stderr.flush()
     _write_crash_log(f"{datetime.now()} [easyocr_worker] 未捕获异常:\n{msg}")
+    _write_state("crashed", error=msg[:500])
 
 sys.excepthook = _global_excepthook
 
@@ -172,6 +212,7 @@ except Exception as e:
 
 def _init_reader():
     """初始化 EasyOCR reader（GPU 优先，父进程可强制 CPU）。"""
+    global _WORKER_MODE
     # 先检查环境变量是否强制CPU
     _force_cpu = os.environ.get("EASYOCR_FORCE_CPU") == "1"
 
@@ -215,6 +256,7 @@ def _init_reader():
     try:
         reader = easyocr.Reader(["ch_sim", "en"], gpu=use_gpu)
         mode = "GPU" if use_gpu else "CPU"
+        _WORKER_MODE = mode
         sys.stderr.write(f"[easyocr_worker] Reader 就绪（{mode}模式）\n")
         sys.stderr.flush()
         return reader
@@ -223,6 +265,7 @@ def _init_reader():
         sys.stderr.write(f"[easyocr_worker] GPU 初始化失败({e})，尝试 CPU\n")
         sys.stderr.flush()
         reader = easyocr.Reader(["ch_sim", "en"], gpu=False)
+        _WORKER_MODE = "CPU"
         sys.stderr.write("[easyocr_worker] Reader 就绪（CPU 模式）\n")
         sys.stderr.flush()
         return reader
@@ -256,6 +299,7 @@ def _main():
     sys.stdout.flush()
     sys.stderr.write("[easyocr_worker] 就绪，等待 stdin 输入\n")
     sys.stderr.flush()
+    _write_state("idle")
 
     for line in sys.stdin:
         line = line.strip()
@@ -267,6 +311,7 @@ def _main():
             img_b64 = payload.get("img", "")
             if not img_b64:
                 raise ValueError("缺少 img 字段")
+            _write_state("busy", last_img_len=len(img_b64))
             sys.stderr.write(f"[easyocr_worker] 收到请求，处理中... (img长度={len(img_b64)})\n")
             sys.stderr.flush()
             text = _process_image(img_b64, reader)
@@ -275,6 +320,7 @@ def _main():
             out = json.dumps({"ok": True, "text": text}, ensure_ascii=False)
             sys.stdout.write(out + "\n")
             sys.stdout.flush()
+            _write_state("idle")
         except Exception as e:
             estr = str(e)
             # ⭐ CUDA OOM / kernel error：GPU context 已损坏，继续跑只会反复卡死占显存
@@ -306,7 +352,8 @@ def _cleanup_gpu():
 
 
 def _signal_handler(signum, frame):
-    """捕获 SIGTERM/SIGINT，先清理 GPU 再退出（proc.terminate() 触发此处理）。"""
+    """捕获 SIGTERM/SIGINT，先记录被终止状态再清理 GPU 退出（proc.terminate() 触发此处理）。"""
+    _write_state("terminated", error=f"收到信号 {signum}，父进程请求终止，正在清理退出")
     _cleanup_gpu()
     sys.exit(0)