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.py

@@ -0,0 +1,62 @@
+from datetime import datetime, time
+
+from pydantic import BaseModel, ConfigDict, field_validator
+
+from app.models.habit import ALL_WEEKDAYS_MASK, HabitStatus, HabitType
+
+
+class HabitBase(BaseModel):
+    name: str
+    habit_type: HabitType
+    weekdays_mask: int = ALL_WEEKDAYS_MASK
+    condition_text: str | None = None
+    reminder_time: time | None = None
+
+    @field_validator("name")
+    @classmethod
+    def name_not_blank(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("습관 이름을 입력해주세요")
+        return v
+
+    @field_validator("condition_text")
+    @classmethod
+    def blank_condition_to_none(cls, v: str | None) -> str | None:
+        if v is None:
+            return None
+        v = v.strip()
+        return v or None
+
+    @field_validator("weekdays_mask")
+    @classmethod
+    def mask_in_range(cls, v: int) -> int:
+        if not (1 <= v <= ALL_WEEKDAYS_MASK):
+            raise ValueError("요일을 최소 하루 이상 선택해주세요")
+        return v
+
+
+class HabitCreate(HabitBase):
+    pass
+
+
+class HabitUpdate(HabitBase):
+    pass
+
+
+class HabitOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    name: str
+    habit_type: HabitType
+    status: HabitStatus
+    weekdays_mask: int
+    condition_text: str | None
+    reminder_time: time | None
+    created_at: datetime
+    completed_at: datetime | None
+
+
+class HabitReorderRequest(BaseModel):
+    habit_ids: list[int]