Add printer types with bed volume + add-printer UI

- PrinterType model: name, bed_x_mm/y/z, linked to Printer via type_id
- Migration 0002: creates printer_types, adds type_id to printers, drops model
- /printer-types page: table + Add Type modal form
- /printers page: Add Printer modal with type dropdown (disabled if no types)
- API: GET/POST/DELETE /api/printer-types

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

alembic/versions/0002_printer_types.py

@@ -0,0 +1,40 @@
+"""printer_types table and link to printers
+
+Revision ID: 0002
+Revises: 0001
+Create Date: 2026-06-18
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0002"
+down_revision: Union[str, None] = "0001"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "printer_types",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("name", sa.String(length=100), nullable=False),
+        sa.Column("bed_x_mm", sa.Integer(), nullable=False),
+        sa.Column("bed_y_mm", sa.Integer(), nullable=False),
+        sa.Column("bed_z_mm", sa.Integer(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("name"),
+    )
+    op.add_column("printers", sa.Column("type_id", sa.Integer(), nullable=True))
+    op.create_foreign_key("fk_printer_type", "printers", "printer_types", ["type_id"], ["id"])
+    op.drop_column("printers", "model")
+
+
+def downgrade() -> None:
+    op.drop_constraint("fk_printer_type", "printers", type_="foreignkey")
+    op.drop_column("printers", "type_id")
+    op.add_column("printers", sa.Column("model", sa.String(length=100), nullable=True))
+    op.drop_table("printer_types")