Add subject options and redesign TV dashboard layout

Subject options:
- New subject_options table (auto-created on startup)
- SubjectOut now includes options list; all eager-loading chains updated
- Admin: Options panel per subject with add, inline edit, and delete
- WS broadcast and dashboard API include options in block subject data

TV dashboard:
- Three equal columns: Timer | Activities | Schedule
- Activities column shows current subject's options in large readable text
- Activities area has subject-colored border and tinted background
- Subject name and label displayed correctly using embedded subject data

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/routers/schedules.py

@@ -5,6 +5,7 @@ from sqlalchemy.orm import selectinload
 
 from app.dependencies import get_db, get_current_user
 from app.models.schedule import ScheduleTemplate, ScheduleBlock
+from app.models.subject import Subject  # noqa: F401 — for selectinload chain
 from app.models.user import User
 from app.schemas.schedule import (
     ScheduleTemplateCreate,
@@ -26,7 +27,7 @@ async def list_templates(
     result = await db.execute(
         select(ScheduleTemplate)
         .where(ScheduleTemplate.user_id == current_user.id)
-        .options(selectinload(ScheduleTemplate.blocks))
+        .options(selectinload(ScheduleTemplate.blocks).selectinload(ScheduleBlock.subject).selectinload(Subject.options))
         .order_by(ScheduleTemplate.name)
     )
     return result.scalars().all()
@@ -60,7 +61,7 @@ async def create_template(
     result = await db.execute(
         select(ScheduleTemplate)
         .where(ScheduleTemplate.id == template.id)
-        .options(selectinload(ScheduleTemplate.blocks))
+        .options(selectinload(ScheduleTemplate.blocks).selectinload(ScheduleBlock.subject).selectinload(Subject.options))
     )
     return result.scalar_one()
 
@@ -74,7 +75,7 @@ async def get_template(
     result = await db.execute(
         select(ScheduleTemplate)
         .where(ScheduleTemplate.id == template_id, ScheduleTemplate.user_id == current_user.id)
-        .options(selectinload(ScheduleTemplate.blocks))
+        .options(selectinload(ScheduleTemplate.blocks).selectinload(ScheduleBlock.subject).selectinload(Subject.options))
     )
     template = result.scalar_one_or_none()
     if not template:
@@ -92,7 +93,7 @@ async def update_template(
     result = await db.execute(
         select(ScheduleTemplate)
         .where(ScheduleTemplate.id == template_id, ScheduleTemplate.user_id == current_user.id)
-        .options(selectinload(ScheduleTemplate.blocks))
+        .options(selectinload(ScheduleTemplate.blocks).selectinload(ScheduleBlock.subject).selectinload(Subject.options))
     )
     template = result.scalar_one_or_none()
     if not template:
@@ -141,8 +142,12 @@ async def add_block(
     block = ScheduleBlock(template_id=template_id, **body.model_dump())
     db.add(block)
     await db.commit()
-    await db.refresh(block)
-    return block
+    result = await db.execute(
+        select(ScheduleBlock)
+        .where(ScheduleBlock.id == block.id)
+        .options(selectinload(ScheduleBlock.subject).selectinload(Subject.options))
+    )
+    return result.scalar_one()
 
 
 @router.patch("/{template_id}/blocks/{block_id}", response_model=ScheduleBlockOut)
@@ -169,8 +174,12 @@ async def update_block(
     for field, value in body.model_dump(exclude_unset=True).items():
         setattr(block, field, value)
     await db.commit()
-    await db.refresh(block)
-    return block
+    result = await db.execute(
+        select(ScheduleBlock)
+        .where(ScheduleBlock.id == block.id)
+        .options(selectinload(ScheduleBlock.subject).selectinload(Subject.options))
+    )
+    return result.scalar_one()
 
 
 @router.delete("/{template_id}/blocks/{block_id}", status_code=status.HTTP_204_NO_CONTENT)