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.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Build a Linux single-file binary for local testing.
+# For a Windows .exe run build.bat on Windows.
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+python3 -m venv .venv 2>/dev/null || true
+# shellcheck disable=SC1091
+source .venv/bin/activate || true
+
+python3 -m pip install --upgrade pip
+python3 -m pip install -r requirements.txt
+python3 -m pip install pyinstaller
+
+pyinstaller \
+  --onefile \
+  --name sephiria_inv \
+  --collect-submodules sephiria_inv \
+  -p . \
+  run.py
+
+echo
+echo "Build done. Output: dist/sephiria_inv"