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>

app/schemas/journal.py

@@ -0,0 +1,126 @@
+from datetime import date, datetime
+
+from pydantic import BaseModel, ConfigDict, field_validator
+
+from app.models.journal import JournalAttachmentType, JournalMood
+
+
+class JournalCategoryBase(BaseModel):
+    name: str
+    color: str | None = None
+
+    @field_validator("name")
+    @classmethod
+    def name_not_blank(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("카테고리 이름을 입력해주세요")
+        return v
+
+    @field_validator("color")
+    @classmethod
+    def blank_color_to_none(cls, v: str | None) -> str | None:
+        if v is None:
+            return None
+        v = v.strip()
+        return v or None
+
+
+class JournalCategoryCreate(JournalCategoryBase):
+    pass
+
+
+class JournalCategoryOut(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    name: str
+    color: str | None
+    sort_order: int | None
+    created_at: datetime
+
+
+class JournalCategoryReorderRequest(BaseModel):
+    category_ids: list[int]
+
+
+class JournalEntryBase(BaseModel):
+    category_id: int
+    entry_date: date
+    title: str | None = None
+    content: str
+    moods: list[JournalMood] = []
+    tags: list[str] = []
+
+    @field_validator("content")
+    @classmethod
+    def content_not_blank(cls, v: str) -> str:
+        v = v.strip()
+        if not v:
+            raise ValueError("내용을 입력해주세요")
+        return v
+
+    @field_validator("title")
+    @classmethod
+    def blank_title_to_none(cls, v: str | None) -> str | None:
+        if v is None:
+            return None
+        v = v.strip()
+        return v or None
+
+    @field_validator("moods")
+    @classmethod
+    def dedupe_moods(cls, v: list[JournalMood]) -> list[JournalMood]:
+        cleaned: list[JournalMood] = []
+        for mood in v:
+            if mood not in cleaned:
+                cleaned.append(mood)
+        return cleaned
+
+    @field_validator("tags")
+    @classmethod
+    def clean_tags(cls, v: list[str]) -> list[str]:
+        cleaned: list[str] = []
+        for raw in v:
+            name = raw.strip()
+            if name and name not in cleaned:
+                cleaned.append(name)
+        return cleaned
+
+
+class JournalEntryCreate(JournalEntryBase):
+    pass
+
+
+class JournalEntryUpdate(JournalEntryBase):
+    pass
+
+
+class JournalAttachmentOut(BaseModel):
+    id: int
+    media_type: JournalAttachmentType
+    original_filename: str
+    has_thumbnail: bool
+
+
+class JournalCalendarDay(BaseModel):
+    entry_date: date
+    total_count: int
+    category_colors: list[str]  # 그 날 엔트리가 있는 카테고리들의 색상(점 표시용, 중복 제거)
+
+
+class JournalDayDetailItem(BaseModel):
+    id: int
+    category_id: int
+    category_name: str
+    category_color: str | None
+    title: str | None
+    content: str
+    moods: list[JournalMood]
+    tags: list[str]
+    attachments: list[JournalAttachmentOut]
+
+
+class JournalOnThisDayItem(JournalDayDetailItem):
+    entry_date: date
+    years_ago: int