Diagnostic v2: log on module import, dual log paths, ship debug.bat

v0.3.3 wrapper only logged once it reached _main(). User reports CMD
window flashes shut and no log file created — meaning Python likely
never reached our code. Two fixes:

1. Move first log write to module top (before any project import) and
   write to BOTH the exe directory AND %LOCALAPPDATA%/sephiria_inv/.
   Either log existing proves Python booted; neither existing means
   PyInstaller bootloader itself failed.

2. Add run-debug.bat that runs the exe with stdout/stderr captured to
   sephiria_inv_console.log and pauses, so the window does not close
   before the user can read it.

run-debug.bat

@@ -0,0 +1,22 @@
+@echo off
+REM Run the exe with output captured. Window does not auto-close.
+setlocal
+cd /d "%~dp0"
+echo Running sephiria_inv.exe ...
+echo.
+sephiria_inv.exe > sephiria_inv_console.log 2>&1
+set EC=%errorlevel%
+echo.
+echo === sephiria_inv.exe exited with code %EC% ===
+echo.
+echo --- sephiria_inv_console.log ---
+if exist sephiria_inv_console.log type sephiria_inv_console.log
+echo --- end console.log ---
+echo.
+echo --- sephiria_inv_startup.log ---
+if exist sephiria_inv_startup.log type sephiria_inv_startup.log
+echo --- end startup.log ---
+echo.
+echo Press any key to close this window.
+pause > nul
+endlocal