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)

events/bp/fragments/__init__.py

@@ -0,0 +1 @@
+from .routes import register as register_fragments

events/bp/fragments/routes.py

@@ -0,0 +1,130 @@
+"""Events app fragment endpoints.
+
+Exposes HTML fragments at ``/internal/fragments/<type>`` for consumption
+by other coop apps via the fragment client.
+"""
+
+from __future__ import annotations
+
+from quart import Blueprint, Response, g, render_template, request
+
+from shared.infrastructure.fragments import FRAGMENT_HEADER
+from shared.services.registry import services
+
+
+def register():
+    bp = Blueprint("fragments", __name__, url_prefix="/internal/fragments")
+
+    _handlers: dict[str, object] = {}
+
+    @bp.before_request
+    async def _require_fragment_header():
+        if not request.headers.get(FRAGMENT_HEADER):
+            return Response("", status=403)
+
+    @bp.get("/<fragment_type>")
+    async def get_fragment(fragment_type: str):
+        handler = _handlers.get(fragment_type)
+        if handler is None:
+            return Response("", status=200, content_type="text/html")
+        html = await handler()
+        return Response(html, status=200, content_type="text/html")
+
+    # --- container-nav fragment: calendar entries + calendar links -----------
+
+    async def _container_nav_handler():
+        container_type = request.args.get("container_type", "page")
+        container_id = int(request.args.get("container_id", 0))
+        post_slug = request.args.get("post_slug", "")
+        paginate_url_base = request.args.get("paginate_url", "")
+        page = int(request.args.get("page", 1))
+        exclude = request.args.get("exclude", "")
+        excludes = [e.strip() for e in exclude.split(",") if e.strip()]
+
+        html_parts = []
+
+        # Calendar entries nav
+        if not any(e.startswith("calendar") for e in excludes):
+            entries, has_more = await services.calendar.associated_entries(
+                g.s, container_type, container_id, page,
+            )
+            if entries:
+                html_parts.append(await render_template(
+                    "fragments/container_nav_entries.html",
+                    entries=entries, has_more=has_more,
+                    page=page, post_slug=post_slug,
+                    paginate_url_base=paginate_url_base,
+                ))
+
+        # Calendar links nav
+        if not any(e.startswith("calendar") for e in excludes):
+            calendars = await services.calendar.calendars_for_container(
+                g.s, container_type, container_id,
+            )
+            if calendars:
+                html_parts.append(await render_template(
+                    "fragments/container_nav_calendars.html",
+                    calendars=calendars, post_slug=post_slug,
+                ))
+
+        return "\n".join(html_parts)
+
+    _handlers["container-nav"] = _container_nav_handler
+
+    # --- container-cards fragment: entries for blog listing cards ------------
+
+    async def _container_cards_handler():
+        post_ids_raw = request.args.get("post_ids", "")
+        post_slugs_raw = request.args.get("post_slugs", "")
+        post_ids = [int(x) for x in post_ids_raw.split(",") if x.strip()]
+        post_slugs = [x.strip() for x in post_slugs_raw.split(",") if x.strip()]
+        if not post_ids:
+            return ""
+
+        # Build post_id -> slug mapping
+        slug_map = {}
+        for i, pid in enumerate(post_ids):
+            slug_map[pid] = post_slugs[i] if i < len(post_slugs) else ""
+
+        batch = await services.calendar.confirmed_entries_for_posts(g.s, post_ids)
+        return await render_template(
+            "fragments/container_cards_entries.html",
+            batch=batch, post_ids=post_ids, slug_map=slug_map,
+        )
+
+    _handlers["container-cards"] = _container_cards_handler
+
+    # --- account-nav-item fragment: tickets + bookings links for account nav -
+
+    async def _account_nav_item_handler():
+        return await render_template("fragments/account_nav_items.html")
+
+    _handlers["account-nav-item"] = _account_nav_item_handler
+
+    # --- account-page fragment: tickets or bookings panel --------------------
+
+    async def _account_page_handler():
+        slug = request.args.get("slug", "")
+        user_id = request.args.get("user_id", type=int)
+        if not user_id:
+            return ""
+
+        if slug == "tickets":
+            tickets = await services.calendar.user_tickets(g.s, user_id=user_id)
+            return await render_template(
+                "fragments/account_page_tickets.html",
+                tickets=tickets,
+            )
+        elif slug == "bookings":
+            bookings = await services.calendar.user_bookings(g.s, user_id=user_id)
+            return await render_template(
+                "fragments/account_page_bookings.html",
+                bookings=bookings,
+            )
+        return ""
+
+    _handlers["account-page"] = _account_page_handler
+
+    bp._fragment_handlers = _handlers
+
+    return bp