fix: include free OpenCode models without -free suffix in suggested models (#1535)

The "opencode-free" suggested-models filter only kept models whose id ends
in "-free", so free-but-unsuffixed models like `big-pickle` (routed via
open-sse/executors/opencode.js MESSAGES_MODELS) never appeared in the
import UI.

Extract the filters into a testable module and include a
KNOWN_FREE_OPENCODE_MODELS allowlist (big-pickle) alongside the "-free"
suffix check.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/api/providers/suggested-models/filters.js

@@ -0,0 +1,20 @@
+// Free OpenCode models that don't use the "-free" id suffix
+const KNOWN_FREE_OPENCODE_MODELS = ["big-pickle"];
+
+export const FILTERS = {
+  "openrouter-free": (models) =>
+    models
+      .filter(
+        (m) =>
+          m.pricing?.prompt === "0" &&
+          m.pricing?.completion === "0" &&
+          m.context_length >= 200000
+      )
+      .map((m) => ({ id: m.id, name: m.name, contextLength: m.context_length }))
+      .sort((a, b) => b.contextLength - a.contextLength),
+
+  "opencode-free": (models) =>
+    models
+      .filter((m) => m.id?.endsWith("-free") || KNOWN_FREE_OPENCODE_MODELS.includes(m.id))
+      .map((m) => ({ id: m.id, name: m.id })),
+};

src/app/api/providers/suggested-models/route.js

@@ -1,25 +1,8 @@
 import { NextResponse } from "next/server";
+import { FILTERS } from "./filters.js";
 
 export const dynamic = "force-dynamic";
 
-const FILTERS = {
-  "openrouter-free": (models) =>
-    models
-      .filter(
-        (m) =>
-          m.pricing?.prompt === "0" &&
-          m.pricing?.completion === "0" &&
-          m.context_length >= 200000
-      )
-      .map((m) => ({ id: m.id, name: m.name, contextLength: m.context_length }))
-      .sort((a, b) => b.contextLength - a.contextLength),
-
-  "opencode-free": (models) =>
-    models
-      .filter((m) => m.id?.endsWith("-free"))
-      .map((m) => ({ id: m.id, name: m.id })),
-};
-
 export async function GET(request) {
   const { searchParams } = new URL(request.url);
   const url = searchParams.get("url");