Sephiria inventory optimizer v0.1.0

- Slab catalog and effect handlers ported from WhiteDog1004/sephiria
- Hill-climbing solver maximizes effect sum on slab-occupied cells
- PIL renderer outputs PNG with effects overlay; downloads + caches slab
  images from img.sephiria.wiki on demand
- Tkinter GUI for picking slabs by tier; CLI also available
- Screenshot recognizer (template matching, beta)
- build.bat / build.sh for portable single-file builds via PyInstaller

build.bat

@@ -0,0 +1,25 @@
+@echo off
+REM Build a portable single-file Windows EXE.
+REM Requires Python 3.10+ on PATH.
+setlocal
+
+if not exist .venv (
+    python -m venv .venv
+)
+call .venv\Scripts\activate.bat
+
+pip install --upgrade pip
+pip install -r requirements.txt
+pip install pyinstaller
+
+pyinstaller ^
+  --onefile ^
+  --noconsole ^
+  --name sephiria_inv ^
+  --collect-submodules sephiria_inv ^
+  -p . ^
+  run.py
+
+echo.
+echo Build done. Output: dist\sephiria_inv.exe
+endlocal