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/calendar/admin/routes.py

@@ -0,0 +1,76 @@
+from __future__ import annotations
+
+from quart import (
+    request, render_template, make_response, Blueprint, g
+)
+
+
+from shared.browser.app.authz import require_admin
+from shared.browser.app.redis_cacher import clear_cache
+
+
+
+
+def register():
+    bp = Blueprint("admin", __name__, url_prefix='/admin')
+    # ---------- Pages ----------
+    @bp.get("/")
+    @require_admin
+    async def admin(calendar_slug: str, **kwargs):
+        from shared.browser.app.utils.htmx import is_htmx_request
+
+        # Determine which template to use based on request type
+        if not is_htmx_request():
+            # Normal browser request: full page with layout
+            html = await render_template("_types/calendar/admin/index.html")
+        else:
+            # HTMX request: main panel + OOB elements
+            html = await render_template("_types/calendar/admin/_oob_elements.html")
+
+        return await make_response(html)
+    
+
+    @bp.get("/description/")
+    @require_admin
+    async def calendar_description_edit(calendar_slug: str, **kwargs):
+        # g.post and g.calendar should already be set by the parent calendar bp
+        html = await render_template(
+            "_types/calendar/admin/_description_edit.html",
+            post=g.post_data['post'],
+            calendar=g.calendar,
+        )
+        return await make_response(html)
+
+
+    @bp.post("/description/")
+    @require_admin
+    @clear_cache(tag="calendars", tag_scope="all")
+    async def calendar_description_save(calendar_slug: str, **kwargs):
+        form = await request.form
+        description = (form.get("description") or "").strip() or None
+
+        # simple inline update, or call a service if you prefer
+        g.calendar.description = description
+        await g.s.flush()
+
+        html = await render_template(
+            "_types/calendar/admin/_description.html",
+            post=g.post_data['post'],
+            calendar=g.calendar,
+            oob=True
+        )
+        return await make_response(html)
+
+
+    @bp.get("/description/view/")
+    @require_admin
+    async def calendar_description_view(calendar_slug: str, **kwargs):
+        # just render the display version without touching the DB (used by Cancel)
+        html = await render_template(
+            "_types/calendar/admin/_description.html",
+            post=g.post_data['post'],
+            calendar=g.calendar,
+        )
+        return await make_response(html)
+    
+    return bp