feat: information pages — CRUD model, admin API, public API

- InfoPage model: slug, title (JSONB locale dict), content (JSONB),
  is_active, sort_order, icon, created_at/updated_at
- CRUD: create, get by id/slug, list, update, delete, reorder
- Admin routes: /admin/info-pages with full CRUD, toggle-active, reorder
  (permissions: settings:read/settings:edit)
- Public routes: /info-pages list active, /info-pages/{slug} get by slug
- Migration 0065: create info_pages table with unique slug index
- Custom pages support: admins can create any info page with any slug

app/database/crud/info_pages.py

@@ -0,0 +1,162 @@
+"""CRUD operations for info pages."""
+
+from datetime import UTC, datetime
+from typing import Any
+
+import structlog
+from sqlalchemy import delete, select, update
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.database.models import InfoPage
+
+
+logger = structlog.get_logger(__name__)
+
+# Fields that can be set via update_info_page
+_ALLOWED_UPDATE_FIELDS: frozenset[str] = frozenset(
+    {
+        'slug',
+        'title',
+        'content',
+        'is_active',
+        'sort_order',
+        'icon',
+    }
+)
+
+# Fields that can be explicitly set to None
+_NULLABLE_UPDATE_FIELDS: frozenset[str] = frozenset(
+    {
+        'icon',
+    }
+)
+
+
+async def create_info_page(
+    db: AsyncSession,
+    *,
+    slug: str,
+    title: dict[str, str],
+    content: dict[str, str],
+    is_active: bool = True,
+    sort_order: int = 0,
+    icon: str | None = None,
+) -> InfoPage:
+    """Create a new info page.
+
+    Raises:
+        IntegrityError: if slug is not unique (caller must handle).
+    """
+    page = InfoPage(
+        slug=slug,
+        title=title,
+        content=content,
+        is_active=is_active,
+        sort_order=sort_order,
+        icon=icon,
+    )
+
+    db.add(page)
+    try:
+        await db.commit()
+    except IntegrityError:
+        await db.rollback()
+        raise
+    await db.refresh(page)
+
+    logger.info('Created info page', page_id=page.id, slug=page.slug)
+    return page
+
+
+async def get_info_page_by_id(db: AsyncSession, page_id: int) -> InfoPage | None:
+    """Get an info page by ID."""
+    result = await db.execute(select(InfoPage).where(InfoPage.id == page_id))
+    return result.scalar_one_or_none()
+
+
+async def get_info_page_by_slug(db: AsyncSession, slug: str) -> InfoPage | None:
+    """Get an info page by slug."""
+    result = await db.execute(select(InfoPage).where(InfoPage.slug == slug))
+    return result.scalar_one_or_none()
+
+
+async def get_all_info_pages(
+    db: AsyncSession,
+    *,
+    include_inactive: bool = False,
+) -> list[InfoPage]:
+    """Get all info pages, ordered by sort_order ascending."""
+    stmt = select(InfoPage)
+    if not include_inactive:
+        stmt = stmt.where(InfoPage.is_active.is_(True))
+
+    stmt = stmt.order_by(InfoPage.sort_order.asc(), InfoPage.id.asc())
+    result = await db.execute(stmt)
+    return list(result.scalars().all())
+
+
+async def update_info_page(
+    db: AsyncSession,
+    page_id: int,
+    **kwargs: Any,
+) -> InfoPage | None:
+    """Update an info page. Only whitelisted fields are applied.
+
+    Raises:
+        IntegrityError: if slug conflicts with another page (caller must handle).
+    """
+    update_data: dict[str, Any] = {}
+    for key, value in kwargs.items():
+        if key not in _ALLOWED_UPDATE_FIELDS:
+            continue
+        if value is None and key not in _NULLABLE_UPDATE_FIELDS:
+            continue
+        update_data[key] = value
+
+    if not update_data:
+        return await get_info_page_by_id(db, page_id)
+
+    update_data['updated_at'] = datetime.now(UTC)
+
+    await db.execute(update(InfoPage).where(InfoPage.id == page_id).values(**update_data))
+    try:
+        await db.commit()
+    except IntegrityError:
+        await db.rollback()
+        raise
+
+    page = await get_info_page_by_id(db, page_id)
+    if page:
+        logger.info(
+            'Updated info page',
+            page_id=page_id,
+            updated_fields=list(update_data.keys()),
+        )
+    return page
+
+
+async def delete_info_page(db: AsyncSession, page_id: int) -> None:
+    """Delete an info page."""
+    await db.execute(delete(InfoPage).where(InfoPage.id == page_id))
+    await db.commit()
+
+    logger.info('Deleted info page', page_id=page_id)
+
+
+async def reorder_info_pages(db: AsyncSession, items: list[dict]) -> None:
+    """Bulk update sort_order for info pages.
+
+    Each dict in *items* must have ``id`` and ``sort_order`` keys.
+    """
+    for item in items:
+        page_id = item.get('id')
+        sort_order = item.get('sort_order')
+        if page_id is None or sort_order is None:
+            continue
+        await db.execute(
+            update(InfoPage).where(InfoPage.id == page_id).values(sort_order=sort_order, updated_at=datetime.now(UTC))
+        )
+
+    await db.commit()
+    logger.info('Reordered info pages', count=len(items))

app/database/models.py

@@ -3699,3 +3699,20 @@ class YandexClientIdMap(Base):
     subid = Column(String(255), nullable=True)
     created_at = Column(AwareDateTime(), server_default=func.now())
     updated_at = Column(AwareDateTime(), server_default=func.now(), onupdate=func.now())
+
+
+class InfoPage(Base):
+    """Static informational page with multilingual title/content (JSONB)."""
+
+    __tablename__ = 'info_pages'
+    __table_args__ = (Index('ix_info_pages_slug', 'slug', unique=True),)
+
+    id = Column(Integer, primary_key=True, index=True)
+    slug = Column(String(200), unique=True, nullable=False, index=True)
+    title = Column(JSONB, nullable=False, server_default='{}')
+    content = Column(JSONB, nullable=False, server_default='{}')
+    is_active = Column(Boolean, nullable=False, default=True, server_default='true')
+    sort_order = Column(Integer, nullable=False, default=0, server_default='0')
+    icon = Column(String(50), nullable=True)
+    created_at = Column(AwareDateTime(), server_default=func.now())
+    updated_at = Column(AwareDateTime(), server_default=func.now(), onupdate=func.now())