test(wiremock): add 30-game library and 6 achievement sets

Local WireMock library grows from 8 to 30 games.
Six games get schema, achievement and percentage stubs.
LocalMocksParseTest checks each stub appid is an owned game.

local/wiremock/mappings/steam-schema-646570.json

@@ -0,0 +1,18 @@
+{
+  "request": {
+    "method": "GET",
+    "urlPath": "/steam/ISteamUserStats/GetSchemaForGame/v2/",
+    "queryParameters": {
+      "appid": {
+        "equalTo": "646570"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "headers": {
+      "Content-Type": "application/json"
+    },
+    "bodyFileName": "steam-schema-646570.json"
+  }
+}