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>

app/schemas/habit_log.py

@@ -0,0 +1,45 @@
+from datetime import date, datetime
+
+from pydantic import BaseModel, ConfigDict
+
+
+class HabitLogOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    habit_id: int
+    log_date: date
+    checked_at: datetime
+
+
+class TodayItem(BaseModel):
+    habit_id: int
+    name: str
+    habit_type: str
+    condition_text: str | None
+    reminder_time: str | None
+    checked: bool
+    completion_rate: float
+    current_streak: int
+    scheduled_days: int
+
+
+class MonthlySummaryDay(BaseModel):
+    log_date: date
+    scheduled_count: int
+    checked_count: int
+
+
+class WeeklyMatrixRow(BaseModel):
+    habit_id: int
+    name: str
+    habit_type: str
+    checks: dict[str, bool | None]  # ISO 날짜 문자열 -> 체크 여부 (None이면 그 요일에 예정되지 않음)
+    completion_rate: float  # 이번 주, 오늘까지 지난 예정일 중 체크한 비율 (%)
+
+
+class HabitStats(BaseModel):
+    completion_rate: float  # 습관 생성일부터 오늘까지, 예정된 날 중 체크한 비율 (%)
+    current_streak: int  # 오늘(또는 어제)부터 거슬러 올라가며 끊기지 않고 체크한 예정일 수
+    scheduled_days: int
+    checked_days: int