add journaling feature: categories, tags, attachments, calendar, and multi-select emotions

Adds an 8th development stage that lets users keep a free-form journal alongside
habit tracking, reusing the existing Google OAuth/DB/PWA infrastructure instead
of a separate project. Users organize entries into custom categories, filter by
a month calendar with day-detail drill-down, attach photos/videos (served via an
authenticated route, never /static), tag entries, and pick multiple emotions per
entry from a curated 9-option set. Includes a global journal prompt bank for
lightweight guided journaling.

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

migrations/versions/0011_journal_entry_multi_mood.py

@@ -0,0 +1,51 @@
+"""allow journal entries to have multiple moods, and expand the mood vocabulary
+
+Revision ID: 0011_journal_entry_multi_mood
+Revises: 0010_add_journal_tables
+Create Date: 2026-08-04
+
+기분을 하나만 고를 수 있던 journal_entry.mood(단일 컬럼)를, 태그처럼 여러 개를 붙일 수 있는
+journal_entry_mood 연결 테이블로 바꾼다. mood 자체가 고정된 값 집합(enum)이라 journal_tag처럼
+별도 이름 엔티티를 둘 필요 없이 값 자체를 PK로 쓴다. 동시에 기존 5종(만족도 스케일)에
+구체적인 감정 9종을 추가한다.
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0011_journal_entry_multi_mood"
+down_revision: Union[str, None] = "0010_add_journal_tables"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+MOOD_VALUES = (
+    "great", "good", "neutral", "bad", "awful",
+    "pain", "achievement", "anger", "excited", "calm", "happy", "worry", "tired", "sad",
+)
+
+
+def upgrade() -> None:
+    op.drop_constraint("ck_journal_entry_mood", "journal_entry", type_="check")
+    op.drop_column("journal_entry", "mood")
+
+    op.create_table(
+        "journal_entry_mood",
+        sa.Column(
+            "entry_id", sa.Integer(), sa.ForeignKey("journal_entry.id", ondelete="CASCADE"), primary_key=True
+        ),
+        sa.Column("mood", sa.String(length=20), primary_key=True),
+        sa.CheckConstraint(
+            "mood in (" + ",".join(f"'{v}'" for v in MOOD_VALUES) + ")", name="ck_journal_entry_mood_mood"
+        ),
+        mysql_engine="InnoDB",
+        mysql_charset="utf8mb4",
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("journal_entry_mood")
+    op.add_column("journal_entry", sa.Column("mood", sa.String(length=20), nullable=True))
+    op.create_check_constraint(
+        "ck_journal_entry_mood", "journal_entry", "mood in ('great','good','neutral','bad','awful')"
+    )