fix(traceback): 从 temp_dir 扫描 .vpi 定位 traceback 模块

sig_files 可能不含 include 的 .vpi；改为直接扫描 temp_dir/*.vpi 匹配 'Module: traceback'，确保 main 模块拿到 Install 符号。

lib/Projectrans/Phase2Translator.py

@@ -2358,21 +2358,28 @@ class Phase2Translator:
         # 直接调用它（不依赖 .ctors/.init_array，避免 MinGW 下 .ctors.65534 不执行）。
         if self.traceback_enabled:
             _tb_sha1: str | None = None
-            for _k, _p in self.sig_files.items():
-                try:
-                    if 'traceback' in os.path.basename(_p):
-                        _tb_sha1 = _k
-                        break
-                    if 'Module: traceback' in _ReadTextCached(_p)[:512]:
-                        _tb_sha1 = _k
-                        break
-                except Exception:
-                    continue
+            _temp_vpi: str = getattr(self, 'temp_dir', '') or ''
+            if _temp_vpi and os.path.isdir(_temp_vpi):
+                for _fn in os.listdir(_temp_vpi):
+                    if not _fn.endswith('.vpi'):
+                        continue
+                    try:
+                        if 'Module: traceback' in _ReadTextCached(os.path.join(_temp_vpi, _fn))[:512]:
+                            _tb_sha1 = _fn[:-4]
+                            break
+                    except Exception:
+                        continue
             if _tb_sha1 is None:
-                for _k, _p in getattr(self, '_shared_source_module_sig_files', {}).items():
-                    if 'traceback' in str(_p):
-                        _tb_sha1 = _k
-                        break
+                for _k, _p in self.sig_files.items():
+                    try:
+                        if 'traceback' in os.path.basename(_p):
+                            _tb_sha1 = _k
+                            break
+                        if 'Module: traceback' in _ReadTextCached(_p)[:512]:
+                            _tb_sha1 = _k
+                            break
+                    except Exception:
+                        continue
             trans.translator.TracebackEnabled = self.traceback_enabled
             if _tb_sha1 is not None:
                 trans.translator.TracebackInstallSymbol = f'{_tb_sha1}.Install'