Add source code, design assets, and CAD samples

requirements.txt

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+# S-CANVAS — runtime dependencies
+# Pinned to versions verified working on the build machine (2026-04).
+#
+# Install:
+#   pip install -r requirements.txt
+#
+# Python: 3.9+ recommended (tested on 3.9.13). 3.11+ ideal for performance.
+# Platform: Windows 10/11. Linux/macOS likely works for Python deps but the GUI
+# (CustomTkinter, tkintermapview) and PyInstaller build are Windows-tuned.
+
+# --- GUI ---
+customtkinter==5.2.2
+tkintermapview==1.29
+Pillow==11.3.0
+
+# --- 3D / mesh ---
+pyvista==0.46.5
+# vtk is pulled in automatically by pyvista (~150MB)
+
+# --- Geospatial / DXF ---
+ezdxf==1.4.2
+pyproj==3.6.1
+rasterio==1.4.3            # optional — for cache/dem/local.tif (NGII GeoTIFF). 미설치 시 AWS Terrarium 만 사용.
+
+# --- Numerical ---
+numpy==2.0.2
+scipy==1.13.1
+matplotlib==3.9.4          # signed-distance polygon paths
+
+# --- Image / video ---
+opencv-python==4.13.0.92    # splash MP4 + harness QualityValidator
+
+# --- Network ---
+requests==2.32.5
+
+# --- AI rendering (Gemini) ---
+google-genai==1.47.0
+# google-auth is pulled in by google-genai; pinned for reproducibility
+google-auth==2.49.2
+
+# --- Persistence / logging ---
+SQLAlchemy==2.0.49
+structlog==25.5.0
+PyYAML==6.0.3
+
+# ─────────────────────────────────────────────────────────────────────────
+# (선택) 배포용 .exe 빌드를 새 PC 에서 만들고 싶을 때만:
+# pip install pyinstaller==6.18.0