feat: The Other Dude v9.0.1 — full-featured email system

ci: add GitHub Pages deployment workflow for docs site

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

backend/alembic/versions/026_system_settings.py

@@ -0,0 +1,41 @@
+"""Add system_settings table for instance-wide configuration.
+
+Revision ID: 026
+Revises: 025
+Create Date: 2026-03-08
+"""
+
+revision = "026"
+down_revision = "025"
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID
+
+
+def upgrade() -> None:
+    op.create_table(
+        "system_settings",
+        sa.Column("key", sa.String(255), primary_key=True),
+        sa.Column("value", sa.Text, nullable=True),
+        sa.Column("encrypted_value", sa.LargeBinary, nullable=True),
+        sa.Column("encrypted_value_transit", sa.Text, nullable=True),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.func.now(),
+            nullable=False,
+        ),
+        sa.Column(
+            "updated_by",
+            UUID(as_uuid=True),
+            sa.ForeignKey("users.id", ondelete="SET NULL"),
+            nullable=True,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("system_settings")