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/templates/partials/habit_form.html

@@ -0,0 +1,42 @@
+<div
+  class="card"
+  x-data="{
+    open: false,
+    mask: 127,
+    alarmOn: false,
+    days: ['월', '화', '수', '목', '금', '토', '일'],
+  }"
+>
+  <button type="button" class="btn btn-secondary btn-block" @click="open = !open">
+    <span x-show="!open">{{ '+ 멈추고 싶은 습관 추가' if habit_type == 'quit' else '+ 만들고 싶은 습관 추가' }}</span>
+    <span x-show="open" x-cloak>닫기</span>
+  </button>
+
+  <form
+    x-show="open"
+    x-cloak
+    style="margin-top: var(--space-2);"
+    hx-post="/habits/new"
+    hx-target="#habit-form-error-{{ habit_type }}"
+    hx-swap="innerHTML"
+  >
+    <input type="hidden" name="habit_type" value="{{ habit_type }}" />
+    <input type="hidden" name="weekdays_mask" :value="mask" />
+
+    <div class="field">
+      <label for="name-{{ habit_type }}">습관 이름</label>
+      <input type="text" id="name-{{ habit_type }}" name="name" required placeholder="{{ '예: 물 2L 마시기' if habit_type == 'build' else '예: 야식 끊기' }}" />
+    </div>
+
+    <div class="field">
+      <label for="condition-{{ habit_type }}">달성 조건 (선택)</label>
+      <input type="text" id="condition-{{ habit_type }}" name="condition_text" placeholder="{{ '예: 하루 8잔 이상' if habit_type == 'build' else '예: 주 3회 이하로 줄이기' }}" />
+    </div>
+
+    {% include "partials/_weekday_alarm_fields.html" %}
+
+    <div id="habit-form-error-{{ habit_type }}" class="form-error-text"></div>
+
+    <button type="submit" class="btn btn-primary btn-block">추가하기</button>
+  </form>
+</div>