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>

migrations/versions/0002_add_condition_text.py

@@ -0,0 +1,24 @@
+"""add condition_text to habit
+
+Revision ID: 0002_add_condition_text
+Revises: 0001_initial
+Create Date: 2026-07-14
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0002_add_condition_text"
+down_revision: Union[str, None] = "0001_initial"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("habit", sa.Column("condition_text", sa.String(length=300), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("habit", "condition_text")