Consolidate bundled plugin schema into the core migration chain

The core chain already owns and reproduces the full bundled schema (deploys run
`flask db upgrade` only). The per-plugin Alembic baselines duplicated those
tables, so `flask plugin upgrade-all` would conflict - a footgun. Remove the 6
bundled plugin migration dirs; the per-plugin Alembic helpers
(alembic_template, PluginMigrationRunner) remain for external/filesystem
plugins. upgrade-all now cleanly no-ops for bundled plugins.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/printers/migrations/versions/0001_baseline.py

@@ -1,27 +0,0 @@
-"""printers plugin: baseline schema
-
-Creates every table owned by the printers plugin per
-shopdb.plugins.alembic_template.PLUGIN_TABLE_OWNERS. The table definitions
-are derived from the SQLAlchemy models at migration runtime so this stays
-in lockstep with the model layer without duplication.
-
-Revision ID: 0001_baseline_printers
-Revises:
-Create Date: 2026-05-30
-
-"""
-from shopdb.plugins.alembic_template import create_plugin_tables, drop_plugin_tables
-
-
-revision = '0001_baseline_printers'
-down_revision = None
-branch_labels = None
-depends_on = None
-
-
-def upgrade():
-    create_plugin_tables('printers')
-
-
-def downgrade():
-    drop_plugin_tables('printers')

plugins/printers/migrations/versions/0002_modelsupplies.py

@@ -1,44 +0,0 @@
-"""printers plugin: add modelsupplies table
-
-Data-driven model -> toner/drum/waste part-number mapping. Replaces the old
-hardcoded supply_parts table.
-
-Revision ID: 0002_modelsupplies_printers
-Revises: 0001_baseline_printers
-Create Date: 2026-06-25
-
-"""
-import sqlalchemy as sa
-from alembic import op
-
-
-revision = '0002_modelsupplies_printers'
-down_revision = '0001_baseline_printers'
-branch_labels = None
-depends_on = None
-
-
-def upgrade():
-    op.create_table(
-        'modelsupplies',
-        sa.Column('modelsupplyid', sa.Integer, primary_key=True),
-        sa.Column('modelnumberid', sa.Integer,
-                  sa.ForeignKey('models.modelnumberid'), nullable=False),
-        sa.Column('supplytype', sa.String(20), nullable=False, server_default='toner'),
-        sa.Column('color', sa.String(20), nullable=False, server_default='none'),
-        sa.Column('capacitytier', sa.String(20), nullable=False, server_default='standard'),
-        sa.Column('partnumber', sa.String(50), nullable=False),
-        sa.Column('marketingname', sa.String(120)),
-        sa.Column('pageyield', sa.Integer),
-        sa.Column('notes', sa.Text),
-        sa.Column('createddate', sa.DateTime, nullable=False),
-        sa.Column('modifieddate', sa.DateTime, nullable=False),
-        sa.Column('isactive', sa.Boolean, nullable=False, server_default=sa.true()),
-        sa.UniqueConstraint('modelnumberid', 'partnumber', name='uq_modelsupply_part'),
-    )
-    op.create_index('idx_modelsupplies_modelnumberid', 'modelsupplies', ['modelnumberid'])
-
-
-def downgrade():
-    op.drop_index('idx_modelsupplies_modelnumberid', table_name='modelsupplies')
-    op.drop_table('modelsupplies')