feat(codex): support native Responses direct-connect with generated model catalog

Codex providers can now run in two modes per provider:

- Proxy-Chat (route takeover): apiFormat=openai_chat, existing Responses<->Chat conversion. Unchanged.

- Native-Responses (direct): apiFormat=openai_responses, no proxy. cc-switch generates ~/.codex/cc-switch-model-catalog.json so Codex shows the custom models and tools work without the freeform apply_patch (type=custom) tool that native gateways like MiMo reject; editing falls back to shell_command.

Catalog generation is keyed on apiFormat (CodexCatalogToolProfile), decoupled from the takeover toggle, so native providers persist a catalog without enabling local route mapping.

Codex's catalog parser requires base_instructions on every entry; the native template carries a neutral default and per-vendor official text overrides it (MiMo, MiniMax). Synthesized catalogs for Qwen/Doubao/LongCat use the neutral default.

Existing native providers must be re-saved once to regenerate a valid catalog (no DB migration).

tests/components/ProviderForm.codexCatalog.test.ts

@@ -15,4 +15,38 @@ describe("ProviderForm Codex catalog helpers", () => {
       { model: "kimi-k2", contextWindow: 128000 },
     ]);
   });
+
+  it("preserves native-profile overrides (parallel tool calls + input modalities + base instructions)", () => {
+    expect(
+      normalizeCodexCatalogModelsForSave([
+        {
+          model: "MiniMax-M3",
+          displayName: "MiniMax-M3",
+          contextWindow: 1000000,
+          supportsParallelToolCalls: true,
+          inputModalities: ["text", "image"],
+          baseInstructions:
+            "  You are Codex, a coding agent based on MiniMax-M3.  ",
+        },
+        // false must be preserved (not dropped as falsy); empty modalities dropped;
+        // empty/whitespace baseInstructions dropped
+        {
+          model: "mimo-v2.5-pro",
+          supportsParallelToolCalls: false,
+          inputModalities: [],
+          baseInstructions: "   ",
+        },
+      ]),
+    ).toEqual([
+      {
+        model: "MiniMax-M3",
+        displayName: "MiniMax-M3",
+        contextWindow: 1000000,
+        supportsParallelToolCalls: true,
+        inputModalities: ["text", "image"],
+        baseInstructions: "You are Codex, a coding agent based on MiniMax-M3.",
+      },
+      { model: "mimo-v2.5-pro", supportsParallelToolCalls: false },
+    ]);
+  });
 });