fix: media group photos saving, add photos to user notifications, admin info in transaction details, remove deep link fallback

- Fix media group collection: use module-level dicts instead of dialog_data
  to avoid race conditions between concurrent handler calls
- Add photo/media group sending in user notifications (add/remove hours)
- Add admin username with emoji to all transaction detail windows
- Add emoji prefixes to detail content fields
- Support multiple photos via JSON array in photo_file_id column
- Change photo_file_id column from String(512) to Text
- Add get_photo_file_ids() helper with backward compat for single file_id
- Add 'All photos' button for media groups in detail views
- Remove /start photo_ deep link fallback handler
- Add Alembic migration for column type change

alembic/versions/a1b2c3d4e5f6_add_photo_file_id_to_hours_transactions.py

@@ -0,0 +1,25 @@
+"""add_photo_file_id_to_hours_transactions
+
+Revision ID: a1b2c3d4e5f6
+Revises: 4fe7f71301e7
+Create Date: 2026-07-14 23:41:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = 'a1b2c3d4e5f6'
+down_revision: Union[str, Sequence[str], None] = '4fe7f71301e7'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('hours_transactions', sa.Column('photo_file_id', sa.String(length=512), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('hours_transactions', 'photo_file_id')

alembic/versions/b2c3d4e5f6g7_change_photo_file_id_to_text.py

@@ -0,0 +1,37 @@
+"""change_photo_file_id_to_text
+
+Revision ID: b2c3d4e5f6g7
+Revises: a1b2c3d4e5f6
+Create Date: 2026-07-15 00:35:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = 'b2c3d4e5f6g7'
+down_revision: Union[str, Sequence[str], None] = 'a1b2c3d4e5f6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.alter_column(
+        'hours_transactions',
+        'photo_file_id',
+        existing_type=sa.String(length=512),
+        type_=sa.Text(),
+        existing_nullable=True,
+    )
+
+
+def downgrade() -> None:
+    op.alter_column(
+        'hours_transactions',
+        'photo_file_id',
+        existing_type=sa.Text(),
+        type_=sa.String(length=512),
+        existing_nullable=True,
+    )