Update Longcat presets to LongCat-2.0 (#4838)

* Update Longcat presets to LongCat-2.0

* fix(proxy): classify LongCat-2.0 as text-only for media sanitizer

The Longcat presets now use LongCat-2.0, but the known_text_only_model
allowlist still only matched the retired longcat-flash-chat tail. Without
this, images pasted into a text-only LongCat-2.0 session are forwarded
upstream instead of being replaced with the unsupported-image marker,
causing a hard rejection. Add longcat-2.0 (keeping the retired name for
saved configs) and a regression test.

---------

Co-authored-by: chengzifeng <chengzifeng@meituan.com>
Co-authored-by: Jason <farion1231@gmail.com>

src/config/codexProviderPresets.ts

@@ -723,7 +723,7 @@ requires_openai_auth = true`,
     config: generateThirdPartyConfig(
       "longcat",
       "https://api.longcat.chat/openai/v1",
-      "LongCat-2.0-Preview",
+      "LongCat-2.0",
     ),
     endpointCandidates: ["https://api.longcat.chat/openai/v1"],
     // 美团 LongCat 官方 Codex 文档用 wire_api=responses 对自家 base_url，原生 Responses，无需路由接管转换
@@ -732,8 +732,8 @@ requires_openai_auth = true`,
     // 注：LongCat 的 /responses 工具类型契约文档化程度最低，建议真机冒烟一次
     modelCatalog: modelCatalog([
       {
-        model: "LongCat-2.0-Preview",
-        displayName: "LongCat 2.0 Preview",
+        model: "LongCat-2.0",
+        displayName: "LongCat 2.0",
         contextWindow: 1048576,
       },
     ]),