feat: initial shared library extraction

Contains shared infrastructure for all coop services:
- shared/ (factory, urls, user_loader, context, internal_api, jinja_setup)
- models/ (User, Order, Calendar, Ticket, Product, Ghost CMS)
- db/ (SQLAlchemy async session, base)
- suma_browser/app/ (csrf, middleware, errors, authz, redis_cacher, payments, filters, utils)
- suma_browser/templates/ (shared base layouts, macros, error pages)
- static/ (CSS, JS, fonts, images)
- alembic/ (database migrations)
- config/ (app-config.yaml)
- editor/ (Lexical editor Node.js build)
- requirements.txt

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

alembic/versions/0003_add_orders.py

@@ -0,0 +1,118 @@
+"""Add orders and order_items tables for checkout"""
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "0003_add_orders"
+down_revision = "0002_add_cart_items"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "orders",
+        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
+        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id"), nullable=True),
+        sa.Column("session_id", sa.String(length=64), nullable=True),
+
+        sa.Column(
+            "status",
+            sa.String(length=32),
+            nullable=False,
+            server_default="pending",
+        ),
+        sa.Column(
+            "currency",
+            sa.String(length=16),
+            nullable=False,
+            server_default="GBP",
+        ),
+        sa.Column(
+            "total_amount",
+            sa.Numeric(12, 2),
+            nullable=False,
+        ),
+
+        # SumUp integration fields
+        sa.Column("sumup_checkout_id", sa.String(length=128), nullable=True),
+        sa.Column("sumup_status", sa.String(length=32), nullable=True),
+        sa.Column("sumup_hosted_url", sa.Text(), nullable=True),
+
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+    )
+
+    # Indexes to match model hints (session_id + sumup_checkout_id index=True)
+    op.create_index(
+        "ix_orders_session_id",
+        "orders",
+        ["session_id"],
+        unique=False,
+    )
+    op.create_index(
+        "ix_orders_sumup_checkout_id",
+        "orders",
+        ["sumup_checkout_id"],
+        unique=False,
+    )
+
+    op.create_table(
+        "order_items",
+        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
+        sa.Column(
+            "order_id",
+            sa.Integer(),
+            sa.ForeignKey("orders.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "product_id",
+            sa.Integer(),
+            sa.ForeignKey("products.id"),
+            nullable=False,
+        ),
+        sa.Column("product_title", sa.String(length=512), nullable=True),
+
+        sa.Column(
+            "quantity",
+            sa.Integer(),
+            nullable=False,
+            server_default="1",
+        ),
+        sa.Column(
+            "unit_price",
+            sa.Numeric(12, 2),
+            nullable=False,
+        ),
+        sa.Column(
+            "currency",
+            sa.String(length=16),
+            nullable=False,
+            server_default="GBP",
+        ),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.func.now(),
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("order_items")
+    op.drop_index("ix_orders_sumup_checkout_id", table_name="orders")
+    op.drop_index("ix_orders_session_id", table_name="orders")
+    op.drop_table("orders")