Initial commit: habit tracker PWA with Google OAuth, push notifications

FastAPI + SQLAlchemy/Alembic + MariaDB backend with Jinja2/htmx/Alpine
server-rendered frontend. Multi-user via Google OAuth, daily habit
tracking, monthly/weekly history views, Web Push reminders via
APScheduler, and PWA support (manifest, service worker, offline caching).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/generate_icons.py

@@ -0,0 +1,50 @@
+"""PWA 아이콘(icon-192, icon-512, icon-maskable-512)을 생성한다.
+Pillow가 필요하다 (런타임 의존성 아님, 아이콘을 새로 만들 때만 `pip install pillow` 후 1회 실행).
+
+사용법: python scripts/generate_icons.py
+"""
+
+from pathlib import Path
+
+from PIL import Image, ImageDraw
+
+ACCENT = (217, 119, 87, 255)  # --color-accent
+WHITE = (255, 255, 255, 255)
+
+OUT_DIR = Path(__file__).resolve().parent.parent / "app" / "static" / "icons"
+
+# 24x24 viewBox 기준 체크마크 좌표 (elbow 3점)
+CHECK_POINTS = [(4.8, 12.0), (9.0, 16.2), (19.0, 6.4)]
+
+
+def draw_icon(size: int) -> Image.Image:
+    img = Image.new("RGBA", (size, size), ACCENT)
+    draw = ImageDraw.Draw(img)
+
+    check_span = size * 0.58  # 24유닛이 차지할 실제 픽셀 크기
+    scale = check_span / 24
+    offset = (size - check_span) / 2
+
+    points = [(offset + x * scale, offset + y * scale) for x, y in CHECK_POINTS]
+    stroke_width = max(2, round(size * 0.066))
+    draw.line(points, fill=WHITE, width=stroke_width, joint="curve")
+
+    # 선 끝을 둥글게 마무리
+    r = stroke_width / 2
+    for x, y in (points[0], points[-1]):
+        draw.ellipse([x - r, y - r, x + r, y + r], fill=WHITE)
+
+    return img
+
+
+def main() -> None:
+    OUT_DIR.mkdir(parents=True, exist_ok=True)
+    draw_icon(192).save(OUT_DIR / "icon-192.png")
+    draw_icon(512).save(OUT_DIR / "icon-512.png")
+    # 배경이 전체를 채우고 체크마크가 중앙 58%에만 있어 마스커블 세이프존(중앙 80%)을 만족한다.
+    draw_icon(512).save(OUT_DIR / "icon-maskable-512.png")
+    print(f"generated icons in {OUT_DIR}")
+
+
+if __name__ == "__main__":
+    main()