feat(phase1): Complete development environment configuration

- Configure Alembic for database migrations with initial schema
- Fix base.py to use lazy loading for async engine (avoids import-time issues)
- Change AI model from sonnet to haiku (claude-3-haiku-20240307)
- Fix pytest version compatibility with pytest-asyncio
- Add frontend package-lock.json

Phase 1 tasks completed:
- F1.1: Development environment (Docker, Node.js 20, Python 3.12, venv)
- F1.2: PostgreSQL with 8 categories seeded
- F1.3: Redis connection verified
- F1.4: Anthropic API configured and tested
- F1.5: Backend server + WebSocket verified

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/alembic/versions/65d30b7402cf_initial_schema.py

@@ -0,0 +1,108 @@
+"""Initial schema
+
+Revision ID: 65d30b7402cf
+Revises: 
+Create Date: 2026-01-26 08:04:31.725883
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '65d30b7402cf'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('admins',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('username', sa.String(length=100), nullable=False),
+    sa.Column('password_hash', sa.String(length=255), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_admins_id'), 'admins', ['id'], unique=False)
+    op.create_index(op.f('ix_admins_username'), 'admins', ['username'], unique=True)
+    op.create_table('categories',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=100), nullable=False),
+    sa.Column('icon', sa.String(length=50), nullable=True),
+    sa.Column('color', sa.String(length=7), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('name')
+    )
+    op.create_index(op.f('ix_categories_id'), 'categories', ['id'], unique=False)
+    op.create_table('game_sessions',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('room_code', sa.String(length=6), nullable=False),
+    sa.Column('status', sa.String(length=20), nullable=True),
+    sa.Column('team_a_score', sa.Integer(), nullable=True),
+    sa.Column('team_b_score', sa.Integer(), nullable=True),
+    sa.Column('current_team', sa.String(length=1), nullable=True),
+    sa.Column('questions_used', sa.ARRAY(sa.Integer()), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+    sa.Column('finished_at', sa.DateTime(timezone=True), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_game_sessions_id'), 'game_sessions', ['id'], unique=False)
+    op.create_index(op.f('ix_game_sessions_room_code'), 'game_sessions', ['room_code'], unique=True)
+    op.create_table('questions',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('category_id', sa.Integer(), nullable=False),
+    sa.Column('question_text', sa.Text(), nullable=False),
+    sa.Column('correct_answer', sa.String(length=500), nullable=False),
+    sa.Column('alt_answers', sa.ARRAY(sa.String()), nullable=True),
+    sa.Column('difficulty', sa.Integer(), nullable=False),
+    sa.Column('points', sa.Integer(), nullable=False),
+    sa.Column('time_seconds', sa.Integer(), nullable=False),
+    sa.Column('date_active', sa.Date(), nullable=True),
+    sa.Column('status', sa.String(length=20), nullable=True),
+    sa.Column('fun_fact', sa.Text(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+    sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_questions_date_active'), 'questions', ['date_active'], unique=False)
+    op.create_index(op.f('ix_questions_id'), 'questions', ['id'], unique=False)
+    op.create_table('game_events',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('session_id', sa.Integer(), nullable=False),
+    sa.Column('event_type', sa.String(length=50), nullable=False),
+    sa.Column('player_name', sa.String(length=100), nullable=True),
+    sa.Column('team', sa.String(length=1), nullable=True),
+    sa.Column('question_id', sa.Integer(), nullable=True),
+    sa.Column('answer_given', sa.Text(), nullable=True),
+    sa.Column('was_correct', sa.Boolean(), nullable=True),
+    sa.Column('was_steal', sa.Boolean(), nullable=True),
+    sa.Column('points_earned', sa.Integer(), nullable=True),
+    sa.Column('timestamp', sa.DateTime(timezone=True), server_default=sa.text('now()'), nullable=True),
+    sa.ForeignKeyConstraint(['question_id'], ['questions.id'], ),
+    sa.ForeignKeyConstraint(['session_id'], ['game_sessions.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_game_events_id'), 'game_events', ['id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_game_events_id'), table_name='game_events')
+    op.drop_table('game_events')
+    op.drop_index(op.f('ix_questions_id'), table_name='questions')
+    op.drop_index(op.f('ix_questions_date_active'), table_name='questions')
+    op.drop_table('questions')
+    op.drop_index(op.f('ix_game_sessions_room_code'), table_name='game_sessions')
+    op.drop_index(op.f('ix_game_sessions_id'), table_name='game_sessions')
+    op.drop_table('game_sessions')
+    op.drop_index(op.f('ix_categories_id'), table_name='categories')
+    op.drop_table('categories')
+    op.drop_index(op.f('ix_admins_username'), table_name='admins')
+    op.drop_index(op.f('ix_admins_id'), table_name='admins')
+    op.drop_table('admins')
+    # ### end Alembic commands ###