Add market admin CRUD: list, create, and delete marketplaces

Replaces placeholder "Market admin" text with a functional admin panel
that lists marketplaces for a page and supports create/delete via sx,
mirroring the events calendar admin pattern.

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

market/sx/sx_components.py

@@ -1516,6 +1516,63 @@ def _market_admin_header_sx(ctx: dict, *, oob: bool = False, selected: str = "")
 # Page admin (/<slug>/admin/) — post-level admin for markets
 # ---------------------------------------------------------------------------
 
+async def _markets_admin_panel_sx(ctx: dict) -> str:
+    """Render the markets list + create form panel."""
+    from quart import g, url_for
+    from shared.services.registry import services
+
+    rights = ctx.get("rights") or {}
+    is_admin = getattr(rights, "admin", False) if hasattr(rights, "admin") else rights.get("admin", False)
+    has_access = ctx.get("has_access")
+    can_create = has_access("page_admin.create_market") if callable(has_access) else is_admin
+    csrf_token = ctx.get("csrf_token")
+    csrf = csrf_token() if callable(csrf_token) else (csrf_token or "")
+
+    post = ctx.get("post") or {}
+    post_id = post.get("id")
+    markets = await services.market.marketplaces_for_container(g.s, "page", post_id) if post_id else []
+
+    form_html = ""
+    if can_create:
+        create_url = url_for("page_admin.create_market")
+        form_html = sx_call("market-admin-create-form",
+                           create_url=create_url, csrf=csrf)
+
+    list_html = _markets_admin_list_sx(ctx, markets)
+    return sx_call("market-admin-panel",
+                  form=SxExpr(form_html), list=SxExpr(list_html))
+
+
+def _markets_admin_list_sx(ctx: dict, markets: list) -> str:
+    """Render the markets list items."""
+    from quart import url_for
+    from shared.utils import route_prefix
+    csrf_token = ctx.get("csrf_token")
+    csrf = csrf_token() if callable(csrf_token) else (csrf_token or "")
+    prefix = route_prefix()
+
+    if not markets:
+        return sx_call("market-admin-empty")
+
+    parts = []
+    for m in markets:
+        m_slug = getattr(m, "slug", "") or (m.get("slug", "") if isinstance(m, dict) else "")
+        m_name = getattr(m, "name", "") or (m.get("name", "") if isinstance(m, dict) else "")
+        post_slug = (ctx.get("post") or {}).get("slug", "")
+        href = prefix + f"/{post_slug}/{m_slug}/"
+        del_url = url_for("page_admin.delete_market", market_slug=m_slug)
+        csrf_hdr = f'{{"X-CSRFToken":"{csrf}"}}'
+        parts.append(sx_call("market-admin-item",
+                            href=href, name=m_name, slug=m_slug,
+                            del_url=del_url, csrf_hdr=csrf_hdr))
+    return "".join(parts)
+
+
+async def render_markets_admin_list_panel(ctx: dict) -> str:
+    """Render the markets admin panel HTML for POST/DELETE response."""
+    return await _markets_admin_panel_sx(ctx)
+
+
 async def render_page_admin_page(ctx: dict) -> str:
     """Full page: page-level market admin."""
     slug = (ctx.get("post") or {}).get("slug", "")
@@ -1523,7 +1580,8 @@ async def render_page_admin_page(ctx: dict) -> str:
     hdr = root_header_sx(ctx)
     child = "(<> " + _post_header_sx(ctx) + " " + admin_hdr + ")"
     hdr = "(<> " + hdr + " " + header_child_sx(child) + ")"
-    content = '(div :id "main-panel" (div :class "p-4 text-stone-500" "Market admin"))'
+    content = await _markets_admin_panel_sx(ctx)
+    content = '(div :id "main-panel" ' + content + ')'
     return full_page_sx(ctx, header_rows=hdr, content=content)
 
 
@@ -1533,7 +1591,8 @@ async def render_page_admin_oob(ctx: dict) -> str:
     oobs = "(<> " + post_admin_header_sx(ctx, slug, oob=True, selected="markets") + " "
     oobs += _clear_deeper_oob("post-row", "post-header-child",
                                "post-admin-row", "post-admin-header-child") + ")"
-    content = '(div :id "main-panel" (div :class "p-4 text-stone-500" "Market admin"))'
+    content = await _markets_admin_panel_sx(ctx)
+    content = '(div :id "main-panel" ' + content + ')'
     return oob_page_sx(oobs=oobs, content=content)