feat: BreakPilot PWA - Full codebase (clean push without large binaries)

All services: admin-v2, studio-v2, website, ai-compliance-sdk,
consent-service, klausur-service, voice-service, and infrastructure.
Large PDFs and compiled binaries excluded via .gitignore.

backend/alembic/versions/20260115_1700_004_phase_materials.py

@@ -0,0 +1,69 @@
+"""Add Phase Materials Table (Feature f19)
+
+Erstellt die phase_materials Tabelle fuer die
+Material-Verknuepfung an Unterrichtsphasen.
+
+Revision ID: 004
+Revises: 003
+Create Date: 2026-01-15 17:00:00
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = '004'
+down_revision: Union[str, None] = '003'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        'phase_materials',
+        sa.Column('id', sa.String(36), primary_key=True),
+        sa.Column('teacher_id', sa.String(100), nullable=False, index=True),
+        sa.Column('title', sa.String(300), nullable=False),
+        sa.Column(
+            'material_type',
+            sa.Enum('document', 'link', 'video', 'image', 'worksheet', 'presentation', 'other',
+                    name='materialtypeenum'),
+            default='document',
+            nullable=False
+        ),
+        sa.Column('url', sa.String(2000), nullable=True),
+        sa.Column('description', sa.Text(), default=''),
+        sa.Column('phase', sa.String(50), nullable=True, index=True),
+        sa.Column('subject', sa.String(100), default=''),
+        sa.Column('grade_level', sa.String(50), default=''),
+        sa.Column('tags', sa.JSON(), default=list),
+        sa.Column('is_public', sa.Boolean(), default=False),
+        sa.Column('usage_count', sa.Integer(), default=0),
+        sa.Column('session_id', sa.String(36), sa.ForeignKey('lesson_sessions.id'), nullable=True, index=True),
+        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
+        sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
+    )
+
+    # Index fuer Phasen-Suche
+    op.create_index(
+        'ix_phase_materials_search',
+        'phase_materials',
+        ['teacher_id', 'phase', 'subject'],
+    )
+
+    # Index fuer oeffentliche Materialien
+    op.create_index(
+        'ix_phase_materials_public',
+        'phase_materials',
+        ['is_public', 'usage_count'],
+        postgresql_where=sa.text('is_public = true')
+    )
+
+
+def downgrade() -> None:
+    op.drop_index('ix_phase_materials_public', table_name='phase_materials')
+    op.drop_index('ix_phase_materials_search', table_name='phase_materials')
+    op.drop_table('phase_materials')
+    op.execute("DROP TYPE IF EXISTS materialtypeenum")