Monorepo: consolidate 7 repos into one

Combines shared, blog, market, cart, events, federation, and account
into a single repository. Eliminates submodule sync, sibling model
copying at build time, and per-app CI orchestration.

Changes:
- Remove per-app .git, .gitmodules, .gitea, submodule shared/ dirs
- Remove stale sibling model copies from each app
- Update all 6 Dockerfiles for monorepo build context (root = .)
- Add build directives to docker-compose.yml
- Add single .gitea/workflows/ci.yml with change detection
- Add .dockerignore for monorepo build context
- Create __init__.py for federation and account (cross-app imports)

shared/alembic/versions/m3k1h7i9j0_add_activity_bus_columns.py

@@ -0,0 +1,113 @@
+"""add unified event bus columns to ap_activities
+
+Revision ID: m3k1h7i9j0
+Revises: l2j0g6h8i9
+Create Date: 2026-02-22
+
+Adds processing and visibility columns so ap_activities can serve as the
+unified event bus for both internal domain events and federation delivery.
+"""
+
+revision = "m3k1h7i9j0"
+down_revision = "l2j0g6h8i9"
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade() -> None:
+    # Add new columns with defaults so existing rows stay valid
+    op.add_column(
+        "ap_activities",
+        sa.Column("actor_uri", sa.String(512), nullable=True),
+    )
+    op.add_column(
+        "ap_activities",
+        sa.Column(
+            "visibility", sa.String(20),
+            nullable=False, server_default="public",
+        ),
+    )
+    op.add_column(
+        "ap_activities",
+        sa.Column(
+            "process_state", sa.String(20),
+            nullable=False, server_default="completed",
+        ),
+    )
+    op.add_column(
+        "ap_activities",
+        sa.Column(
+            "process_attempts", sa.Integer(),
+            nullable=False, server_default="0",
+        ),
+    )
+    op.add_column(
+        "ap_activities",
+        sa.Column(
+            "process_max_attempts", sa.Integer(),
+            nullable=False, server_default="5",
+        ),
+    )
+    op.add_column(
+        "ap_activities",
+        sa.Column("process_error", sa.Text(), nullable=True),
+    )
+    op.add_column(
+        "ap_activities",
+        sa.Column(
+            "processed_at", sa.DateTime(timezone=True), nullable=True,
+        ),
+    )
+
+    # Backfill actor_uri from the related actor_profile
+    op.execute(
+        """
+        UPDATE ap_activities a
+        SET actor_uri = CONCAT(
+            'https://',
+            COALESCE(current_setting('app.ap_domain', true), 'rose-ash.com'),
+            '/users/',
+            p.preferred_username
+        )
+        FROM ap_actor_profiles p
+        WHERE a.actor_profile_id = p.id
+          AND a.actor_uri IS NULL
+        """
+    )
+
+    # Make actor_profile_id nullable (internal events have no actor profile)
+    op.alter_column(
+        "ap_activities", "actor_profile_id",
+        existing_type=sa.Integer(),
+        nullable=True,
+    )
+
+    # Index for processor polling
+    op.create_index(
+        "ix_ap_activity_process", "ap_activities", ["process_state"],
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_ap_activity_process", table_name="ap_activities")
+
+    # Restore actor_profile_id NOT NULL (remove any rows without it first)
+    op.execute(
+        "DELETE FROM ap_activities WHERE actor_profile_id IS NULL"
+    )
+    op.alter_column(
+        "ap_activities", "actor_profile_id",
+        existing_type=sa.Integer(),
+        nullable=False,
+    )
+
+    op.drop_column("ap_activities", "processed_at")
+    op.drop_column("ap_activities", "process_error")
+    op.drop_column("ap_activities", "process_max_attempts")
+    op.drop_column("ap_activities", "process_attempts")
+    op.drop_column("ap_activities", "process_state")
+    op.drop_column("ap_activities", "visibility")
+    op.drop_column("ap_activities", "actor_uri")