Embed labels in filter criteria (Stash-style) to retire pill resolver

Store {id, label} objects instead of bare IDs in MultiCriterion value/excludes.
FilterSelect pills now render directly from the embedded labels — no DB round-trip
to _resolve_game/device/platform_options. The filter URL and saved presets are
self-describing. MultiCriterion.to_q() extracts ids for querying; bare ints are
still accepted for backward compatibility.

Closes #9

https://claude.ai/code/session_01EyAJcMoDktLrY9tSbdHViA

games/static/js/search_select.js

@@ -435,10 +435,12 @@
               return;
             }
             var value = pill.getAttribute("data-value");
+            var label = pill.getAttribute("data-label") || "";
+            var entry = label ? {id: value, label: label} : value;
             if (pill.getAttribute("data-search-select-type") === "exclude") {
-              excluded.push(value);
+              excluded.push(entry);
             } else {
-              included.push(value);
+              included.push(entry);
             }
           });
         }