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)

federation/app.py

@@ -0,0 +1,84 @@
+from __future__ import annotations
+import path_setup  # noqa: F401  # adds shared/ to sys.path
+from pathlib import Path
+
+from quart import g, request
+from jinja2 import FileSystemLoader, ChoiceLoader
+
+from shared.infrastructure.factory import create_base_app
+from shared.services.registry import services
+
+from bp import (
+    register_identity_bp,
+    register_social_bp,
+    register_fragments,
+)
+
+
+async def federation_context() -> dict:
+    """Federation app context processor."""
+    from shared.infrastructure.context import base_context
+    from shared.services.navigation import get_navigation_tree
+    from shared.infrastructure.cart_identity import current_cart_identity
+    from shared.infrastructure.fragments import fetch_fragment
+
+    ctx = await base_context()
+
+    ctx["nav_tree_html"] = await fetch_fragment(
+        "blog", "nav-tree",
+        params={"app_name": "federation", "path": request.path},
+    )
+    # Fallback for _nav.html when nav-tree fragment fetch fails
+    ctx["menu_items"] = await get_navigation_tree(g.s)
+
+    # Cart data (consistent with all other apps)
+    ident = current_cart_identity()
+    summary = await services.cart.cart_summary(
+        g.s, user_id=ident["user_id"], session_id=ident["session_id"],
+    )
+    ctx["cart_count"] = summary.count + summary.calendar_count + summary.ticket_count
+    ctx["cart_total"] = float(summary.total + summary.calendar_total + summary.ticket_total)
+
+    # Actor profile for logged-in users
+    if g.get("user"):
+        actor = await services.federation.get_actor_by_user_id(g.s, g.user.id)
+        ctx["actor"] = actor
+    else:
+        ctx["actor"] = None
+
+    return ctx
+
+
+def create_app() -> "Quart":
+    from services import register_domain_services
+
+    app = create_base_app(
+        "federation",
+        context_fn=federation_context,
+        domain_services_fn=register_domain_services,
+    )
+
+    # App-specific templates override shared templates
+    app_templates = str(Path(__file__).resolve().parent / "templates")
+    app.jinja_loader = ChoiceLoader([
+        FileSystemLoader(app_templates),
+        app.jinja_loader,
+    ])
+
+    # --- blueprints ---
+    # Well-known + actors (webfinger, inbox, outbox, etc.) are now handled
+    # by the shared AP blueprint registered in create_base_app().
+    app.register_blueprint(register_identity_bp())
+    app.register_blueprint(register_social_bp())
+    app.register_blueprint(register_fragments())
+
+    # --- home page ---
+    @app.get("/")
+    async def home():
+        from quart import render_template
+        return await render_template("_types/federation/index.html")
+
+    return app
+
+
+app = create_app()